Twelve days

What actually is teeth whitening, and does it wear off?

The mechanism: hydrogen peroxide is a small enough molecule to diffuse straight through enamel into the dentine underneath. There it breaks down into reactive oxygen species that cleave the double bonds in the large pigmented molecules staining the tooth, splitting them into smaller colourless fragments. It is not cleaning your teeth — whitening toothpaste does that, by abrasion, and only touches the surface. Peroxide chemically alters the pigment inside the tooth.

Does it rebound like creatine? No — the opposite. Creatine reverses in about a month because you stop supplying it and the water leaves the muscle. Whitening breaks pigment molecules apart, and they do not reassemble. The whiteness is genuinely yours. What happens instead is that new stain slowly accumulates from food and drink — usually 6 months to 2 years before you would want a top-up.

One honest caveat: during treatment the teeth dehydrate slightly, which makes them look whiter than the true result. Over the 24–48 hours after finishing they rehydrate and darken back a little. The day-12 shade is real but flattering; do not panic when it settles.

Sensitivity is the common side effect and is temporary. Do not overlap the strips onto your gums, and do not leave them on longer than instructed. They only work on natural enamel — fillings, crowns and veneers will not change colour. Dry your teeth with a tissue before applying; it noticeably improves contact.

While whitening, your teeth are temporarily more porous and stain more easily. Coffee, tea, cola, red wine, berries, tomato sauce and — note your own dinner list — curry are the worst offenders. Turmeric is a serious stainer. Swap it out for the 12 days or rinse immediately after.

So what do I actually buy for my teeth?

The legal position in the UK: products sold directly to consumers are capped at 0.1% hydrogen peroxide, which has minimal whitening effect. Anything above 0.1% and up to 6% is restricted to dentists and registered dental professionals, under the Dentists Act 1984 and consumer protection legislation. Crest 3D Whitestrips are US-formulation at roughly 5–6% — they work, and they are bought here as imports, which sits outside that framework.

The thing I would actually spend money on first is a hygienist scale and polish — roughly £50–80, often bookable privately within a few days. It removes surface staining and hardened calculus that you physically cannot shift at home. Your teeth look immediately cleaner, any whitening afterwards works better on a clean surface, and it removes a major bacterial reservoir that is very likely feeding your breath problem. It is the highest value-per-pound purchase on this entire page because it solves two things at once.

After that: a dentist-supplied take-home kit is the fully legal and most effective route (~£250–450). Imported strips are the cheap route (~£30–45). UK high-street 0.1% products are legal but will do little beyond surface stain.

My breath is bad all the time except right after brushing. How do I fix it?

Your own observation is the useful evidence. Fine right after brushing, fine while chewing gum, bad the rest of the time — that is the textbook picture of intra-oral volatile sulfur compounds (hydrogen sulfide, methyl mercaptan), produced by anaerobic bacteria breaking down proteins. Brushing removes some mechanically; gum stimulates saliva. Both wear off and the smell returns. Nothing exotic is going on.

The critical fact: those bacteria live overwhelmingly on the back surface of your tongue, not on your teeth. That is precisely why brushing your teeth does not fix it. In a controlled crossover trial, a tongue scraper reduced VSCs by 75% versus 45% for a toothbrush — and a toothbrush is the wrong shape for the job anyway.

Use zinc, not Listerine. Zinc ions bind sulfur compounds and convert them into non-volatile zinc sulfides — they chemically neutralise the smell rather than covering it. Alcohol-based mouthwashes mask with flavour and dry the mouth, which makes things worse once they wear off.

The routine — twice daily, and never skip the bedtime one

• Interdental brushes or floss first. Dislodge debris before brushing. Smell the floss — that is the smell in your mouth.
• Brush two minutes, fluoride toothpaste.
• Spit, do not rinse. Rinsing washes the fluoride straight off.
• Tongue scrape. As far back as you can tolerate, pull forward, 6–8 passes, rinsing the scraper each time. The coating that comes off is the source.
• Zinc mouthwash last.

Through the day: sip water constantly rather than occasionally — steady saliva is the natural defence, and long gaps with nothing to eat or drink were making this measurably worse. Xylitol gum after meals. Rinse with water after milk and shakes, because milk protein feeds exactly these bacteria and you are now drinking a lot of it.

The decision rule: if two weeks of doing all of the above properly changes nothing, book a dentist. Not because I am guessing at a cause, but because at that point the reservoir is somewhere you cannot reach yourself.

Will salicylic acid body wash actually give me good body skin?

Yes, for body acne, chest and back spots, and rough or bumpy texture — which is most of what people mean. Salicylic acid is oil-soluble, so it gets into the pore rather than just sitting on the surface. Realistic timeline is 10–14 days for visible improvement, so again, the window works.

The thing almost everyone gets wrong: they lather and rinse straight off. The acid needs contact time. Leave it on your skin for a full 60 seconds before rinsing — chest, back, shoulders. That pause is the entire product. People who skip it conclude it does not work.

A 2% salicylic wash is the standard. Moisturise afterwards; it can be drying at first.

Is protein powder unhealthy?

No. Whey is filtered milk protein. It is food, processed the same way cheese-making processes milk. There is no mechanism by which it is bad for you, and no evidence base suggesting it is. It is a convenience, not a drug.

But the more important point is the one underneath: you do not need it at all. Eggs, milk, chicken, yogurt and cheese cover your entire protein target easily. At 52kg you need around 120g a day, and that is four normal meals — not a supplement problem.

The reason this matters is that "I ran out of powder" became "so I cannot train." That chain was never real.

Creatine — when do I take it, does it need a shake?

Any time of day. With water, milk, juice or nothing. Not near training, not with protein, no rules whatsoever. The idea that it needs a shake is the invented link that has been costing you workouts.

The one genuinely useful optimisation for your 12 days: normally 5g a day is fine and saturates the muscle over about 3–4 weeks — too slow for your deadline. If you want maximum fullness by day 12, do a loading phase: 20g a day split into 4 × 5g for the first 5–7 days, then drop to 5g daily. That saturates in about a week instead of a month. Split the doses — 20g in one go can upset your stomach.

This is the single most effective "look bigger in 12 days" lever available to you, and it is about £10. The 1–2kg it puts on is water inside the muscle, not fat, and at 52kg it is genuinely visible.

How do I fix waking late and sleeping late in 12 days?

Not by going to bed earlier. If you try that you will lie awake, conclude it failed, and go back to 3am. Sleep timing is driven by your body clock, and the body clock is set by light and by wake time — not by bedtime.

The actual protocol, in order of impact:

• Fixed wake time, every day, regardless of how badly you slept. This is the anchor. It is the whole thing.
• 10–20 minutes of daylight within an hour of waking. Outside, not through a window — glass blocks most of what matters. This is dramatically stronger than people expect.
• No naps while you are shifting. You need the sleep pressure to build.
• Bedtime then moves earlier on its own, usually within 3–5 days, because you are actually tired.

You cannot force the back end of the day. You can absolutely force the front end, and the back end follows.

Can I get bigger and fill out in 12 days?

Partly, and it is worth being precise so you do not feel cheated on day 12.

What genuinely changes: creatine saturation (1–2kg of intramuscular water — real visible fullness), glycogen refill from finally eating consistently (your muscles have been running empty, and full muscles look considerably bigger), a small amount of actual new tissue since you are a total beginner at 19 with the entire novice window intact, and the pump on the day itself.

What does not: meaningful new muscle mass. That is 12–16 weeks, not 12 days. Nobody can change that and anyone selling you otherwise is lying.

Realistically you can be 1.5–2.5kg heavier and noticeably fuller in 12 days, which at 52kg is a visible difference in how clothes sit. That is a real win. It is just not "muscular."

What about being pale?

Gradual self-tan is the answer here — a gradual tanning moisturiser applied over a few days looks far more natural than a one-off application the night before, and it is entirely reversible if you overdo it. Exfoliate first, go light on knees, elbows, ankles and knuckles, and wash your hands afterwards.

Sunbeds are the one thing on this whole page I would tell you to skip outright. The skin cancer risk is real and well established, and it is not a trade worth making for 12 days.

Did the 1pm meal deal ruin the day?

No. You needed about 2,800 kcal and you got 1,000. You were 3,000 kcal short across two days, not over. Your instinct fired in the wrong direction — the meal deal was one of the few things that went right.

At 4:45pm with 1,000 eaten, the day was completely rescuable: sandwich and milk (700), dinner (850), evening yogurt and granola (600) gets you to 3,150. That was three easy things and about 35 minutes of total effort.

Heavy 5s, or 12/10/8? What actually builds size?

Your cousin is right about the thing that matters most — progressive overload is the mechanism. He is wrong that heavy 5s are better for size. That is strength orthodoxy applied to a size goal.

The robust finding: hypertrophy is roughly equivalent across about 5–30 reps, as long as the set is taken close enough to failure. Low reps are better for strength — a neural adaptation, not a bigger muscle. What actually drives size is total hard sets per muscle per week, and heavy 5s cost far more fatigue per set, which buys you fewer sets.

For you — novice, 52kg, unlearned technique, 12-day window — heavy 5s are the worst of the options: highest injury risk on lifts you have not grooved, most systemic fatigue, most soreness. And being sore on day 12 makes you look and feel worse, not better.

Do this instead: 8–12 reps, stop with 2–3 reps left in you, full range with a controlled lowering phase. Bias volume toward side delts, upper chest, back width and arms — the muscles that change how a narrow frame reads.

How do I actually do progressive overload?

Double progression. Two variables, changed one at a time:

• Pick a rep range — 8–12.
• Start at a weight you can do 8 clean reps with 2 left in the tank.
• Each session, try to add a rep to each set.
• When every set hits 12, add the smallest increment — 2.5kg upper body, 5kg lower — and drop back to 8.
• Repeat forever. That is the entire system.

Write the weight and reps down every single session. This is not admin — the logging is the overload. Without a record of last time, you cannot beat last time, and you will drift at the same weight for months without noticing. The Train tab in the loading page does this and tells you when you have earned more weight.

Drop sets, practically: take a set near failure, immediately strip about 25% of the weight, keep going with no rest. It is a volume shortcut, not better than simply doing another straight set. Skip it — except on day 12, on lateral raises and curls, purely for the pump.

Should I start Differin / adapalene / a retinoid?

No — and the timing here is the whole point. Retinoids cause an initial purge: microcomedones already under the skin surface all at once, so things get visibly worse for roughly two to six weeks before they get better. Plus dryness and peeling in the first fortnight.

Starting a retinoid 12 days before you see people is the worst possible timing. It is genuinely the most effective over-the-counter thing for long-term skin, and it is completely wrong for this deadline.

Start it on day 13. Pea-sized amount, at night, every third night to begin with, moisturiser on top.

Is my mum's dermaviduals any good, or should I just buy CeraVe?

Dermaviduals is a genuinely well-regarded German line built on corneotherapy — the approach of repairing the skin barrier rather than stripping it. Its base is DMS, a lamellar structure that mimics your own barrier lipids, with no emulsifiers, no fragrance and no preservatives. Skin therapists rate it, it is expensive to buy, and you get it free. Use the cleansing milk and the moisturiser. That is your base sorted at zero cost.

But be clear what it is: barrier support, not an acne treatment. Barrier health is genuinely foundational — most people's skin is worse because they over-strip it — but it will not clear spots on its own.

So the stack is: free dermaviduals as the base, cheap actives on top.

• Benzoyl peroxide 2.5% — for inflammatory spots. Works within days to weeks, no purge. 2.5% is as effective as 10% with far less irritation. It bleaches fabric, so use white towels and pillowcases.
• Salicylic acid 2% — congestion, and the body wash for chest and back.
• Moisturiser with SPF every morning — the difference between skin that improves and skin that stalls.

CeraVe is cheap and well-formulated, but you do not need their moisturiser when dermaviduals is free. Buy their SA Smoothing Cleanser for your body instead — that is the gap it fills.

Does the LED mask actually do anything?

Some. Red light (around 630–660nm) has modest evidence for inflammation and collagen; blue light (around 415nm) has some evidence for acne by killing the bacteria involved. Home devices are considerably weaker than clinical ones, so the effect size is small.

Verdict: it is free and it is not going to hurt you. Use it while you do something else. Do not build the plan around it, and do not let "I did the mask" substitute for the things that actually work.

Body smell and breath

Antiperspirant, applied at night. This is the one almost nobody knows. Deodorant masks smell; antiperspirant (aluminium salts) actually reduces sweat. It works best applied to clean, dry skin before bed, because sweat ducts are least active overnight and the plugs form properly. Applying it to damp skin in a rush after a morning shower is why it seems not to work. Shower in the morning as normal — the antiperspirant is still there.

Breath: scrape your tongue. The large majority of the compounds causing bad breath come from the back of the tongue, not the teeth. A tongue scraper costs about £3 and outperforms mouthwash, which mostly masks. Then floss — trapped food between teeth is the second source. If it persists after two weeks of both, see a dentist, because persistent breath issues can indicate gum disease or decay, and neither fixes itself.

The nose. The little dots that will not go away.

What is on your nose is almost certainly sebaceous filaments, not blackheads, and confusing the two is the most common mistake in skincare.

Sebaceous filaments are normal anatomy. They are the natural lining of the pore that channels oil to the surface. Everyone has them. They are uniform in size and colour, evenly distributed across the nose and inner cheeks, and greyish-tan. Blackheads (open comedones) are genuinely clogged pores — darker, scattered irregularly, raised, varying in size.

Why this matters: sebaceous filaments cannot be removed. They refill in about 30 days because that is their function. Squeezing them or using pore strips gives a satisfying result for a fortnight, stretches the pore, damages the barrier, and they return. An entire industry sells extraction tools for a normal body part.

What actually helps is keeping them from filling and reducing how visible they are: salicylic acid (oil-soluble, so it penetrates the sebum inside the pore — the single most relevant active for this complaint) and niacinamide (regulates oil, reduces the appearance of pore size). Long term, a retinoid — but not before day 13.

The marks left from trimming weeks ago

Two different things are likely mixed together here, and they have completely different timelines:

• Folliculitis — inflammation or minor infection of the hair follicles, very common after trimming or shaving. Small red bumps or pustules centred on follicles. This does respond within 12 days to a benzoyl peroxide wash and leaving the area alone.
• Post-inflammatory marks — the flat red or brown patches left after a spot has healed. These are not active lesions. Honestly: these take months to fade, not days. Nothing clears them in 12 days. SPF stops them darkening further; azelaic acid and niacinamide speed them up modestly; time does the rest.

On re-trimming: you reacted badly last time and it lasted weeks, so the day-11 slot in the sequence is too risky for you specifically. Do a small test patch now, and if it is fine, do the full trim around day 8 so there is buffer to settle.

How to trim without repeating it: wipe the clippers with alcohol first — dirty blades are a direct cause of folliculitis. Trim with a guard rather than shaving close, on clean dry skin, in the direction of growth. Do not trim over active spots. Afterwards use benzoyl peroxide or an antiseptic, not just a soothing lotion — Aveeno calms irritation but has no antimicrobial action, which is likely why last time did not settle.

Ice rollers, gua sha, microneedling

Ice roller — real but brief. Cold constricts blood vessels and reduces puffiness for roughly 30–60 minutes. Genuinely worth doing on the morning of day 12. No lasting benefit, so do not build a routine around it.

Gua sha — marginal. Mild temporary lymphatic de-puffing, feels good. The claims about sculpting your jawline are false; you cannot change facial structure with a stone. Aggressive use can bruise and irritate. Harmless, low value.

Microneedling — no, and especially not now. At-home rollers create micro-wounds. On skin with active spots that means spreading bacteria, risking infection, and visible redness for days. Professional microneedling has real evidence for texture and scarring, but it needs downtime and several sessions over months. Doing this before day 12 is the highest-risk item on your whole list and could easily make you look worse on the day.

Why your face breaks out every time you shave

This is pseudofolliculitis barbae — razor bumps — and "against the grain, from different angles, as extreme as I can" is close to the exact recipe for producing it.

The mechanism: shaving against the grain pulls the hair up out of the follicle, cuts it, and lets it retract below the skin surface with a freshly sharpened tip. As it regrows it either pierces the follicle wall from the inside or re-enters the skin from the outside. Your immune system treats that hair as a foreign body and mounts an inflammatory response. That is the red bump. Multiple passes from multiple angles multiplies both the trauma and the number of hairs left cut below the surface.

The trap: the closer you chase, the worse it gets. You are pursuing smoothness with a method that guarantees bumps.

Body hair — as close as possible without the bumps

The honest trade: closeness of cut correlates directly with ingrown risk. That is biology, not technique failure. But there is enormous room between "stubble" and "covered in bumps," and you are standing at the wrong end of it.

The answer is a trimmer with a 0.5–1mm guard. At any distance a human being will actually see you from, 0.5mm on a chest is visually indistinguishable from clean-shaven. It leaves the hair just above skin level, which means essentially no ingrown risk. That is roughly 95% of the visual result for approximately 0% of the cost.

You have been chasing the last 5% and paying for it with red bumps for weeks. It is a bad trade and it is the whole reason you have the problem.

If you want closer than that: a foil body shaver — the foil physically prevents cutting below skin level, unlike a blade. With the grain, after a warm shower, test patch first, and on day 8. Never on day 12.

But with the grain leaves stubble. How do I actually get smooth?

Progressive reduction. This is how traditional wet shaving works and it gets you smoother than aggressive trimming, with less irritation. The principle: you do not remove the hair in one forceful pass, you reduce it over several gentle ones, re-lathering every time.

• Pass 1 — with the grain. Takes the bulk off.
• Re-lather completely.
• Pass 2 — across the grain (perpendicular to growth). Shorter hair, less resistance.
• Re-lather completely.
• Pass 3 — against the grain. The hair is already short, so this takes almost nothing and barely stresses the skin.

The rule that makes it work: never let the blade touch skin that is not lathered. No going back over a missed patch without re-lathering. That one habit causes most razor burn.

What actually helps closeness: a shaving brush (£10 — lifts the hairs off the face so the blade catches them, and works lather into the base: better closeness and less irritation at once), pre-shave oil for glide, and mapping your grain — let it grow two days, rub in different directions, feel which way is smooth. Your neck almost certainly grows differently from your cheeks.

The honest limits: cheeks tolerate against-the-grain far better than the neck — thinner skin, chaotic grain, more curl. A very common end state is three passes on the cheeks and two on the neck. If your hair is genuinely coarse and curly, full ATG on the neck may never be comfortable. That is biology, not technique.

Build up, do not jump straight to three passes. Next shave: WTG only, watch 48 hours. Clean? Add across-the-grain. Still clean? Add ATG on cheeks only. By around day 8 you will know exactly what your face tolerates, with time to spare. And note: at conversational distance a two-pass and a three-pass shave look identical — the difference is tactile, not visual.

Can I "unlock" an inch or two of height?

Diurnal variation is real: you measure 1.5–2cm taller in the morning. Intervertebral discs compress under load through the day and rehydrate overnight while you are horizontal. Measure at 11pm and again at 8am and the difference is close to three quarters of an inch. That is physiology, not a trick.

Posture is the other real component — and where the "two inches" claim comes from. Realistic gain from correcting it is 0.5–2cm, not two inches. But with forward head posture and a rounded upper back — very likely if you sit and code for hours — you are at the higher end.

Combined, the gap between your worst and best measurement is genuinely 2–4cm. So measuring 5'7" slouched at night and 5'8" standing tall in the morning is entirely possible. Be clear what that is though: measurement conditions, not new bone.

The useful framing: the height you present every day is your habitual posture, not your best measurement. Fixing that changes how tall you look permanently.

Still growing at 19? Growth plates are likely fused or nearly. A small amount may remain but do not plan on inches. What supports whatever is left is exactly the current plan — eating enough and sleeping properly. Chronic under-eating in adolescence genuinely suppresses growth.