Most hair problems come down to four things: too much heat, too much water, the wrong products for your texture, and a scalp nobody is looking after.

That’s a reductive summary of a large subject, and it holds up surprisingly well. Before buying anything, it’s worth knowing which of those four is actually your problem — because the fix for heat damage is nothing like the fix for build-up, and both look similar in the mirror.

These guides are written for hair in Britain specifically, which matters more than it sounds. Hard water across most of England changes how products behave. Humidity here is high year-round, not just in summer. And the cycle of cold outdoor air and dry central heating from October to March is hard on both hair and scalp in ways that most international advice doesn’t account for.

Start with the scalp

If you read one thing here, read this. Hair grows out of skin, and an inflamed, congested or stripped scalp produces worse hair regardless of what you put on the lengths.

Scalp care routine covers the four steps — cleansing, exfoliation, deep cleansing and treatment — and how to work out which scalp type you actually have.

Two specific problems worth naming: persistent flaking is usually seborrhoeic dermatitis rather than dryness, and it needs an antifungal rather than a moisturiser — see anti-dandruff shampoo. And hair that has slowly got worse over months with no obvious cause is very often product and mineral build-up, covered in clarifying shampoo.

By hair type

Curly and coily hair. The layering approach — leave-in, cream, gel, applied to soaking wet hair — is in curly hair products. If your curls have stopped responding altogether, curl revival products walks through diagnosing whether it’s build-up, protein imbalance or damage.

Frizz-prone hair. Frizz is a moisture problem before it’s a product problem. Anti-frizz hair products explains the mechanism and why the glycerin in your favourite product may be the reason it stopped working in August.

Fine or thinning hair. Fine and thinning are different problems needing opposite products — the distinction is in hair thickening products.

Colour

Colour fade is largely caused by things you do at home in the fortnight after the appointment. Hair colour care covers the first 72 hours, why sulphate-free matters, and the hard water problem no colourist mentions.

For tone maintenance between appointments: purple shampoo for brassy blondes (used far less often than most people do), colour-depositing conditioners for faded intensity, and root touch-up sprays for regrowth.

Whatever you use, patch test 48 hours before every colour appointment — including with a colourist you’ve used for years. Sensitisation to hair dye develops over time.

Heat and styling

The temperature you style at matters more than the brand you buy. A £250 straightener at 230°C will damage your hair faster than a £40 one at 160°C.

Hair styling tools gives the temperature guide by hair type and explains what the marketing terms actually mean. Heat protectant spray covers how to apply it so it works, which most people get wrong.

And for the days you skip the iron entirely, heatless curls produce results that last longer than tongs with no thermal damage at all.

Hair loss and thinning

This one deserves proper attention rather than a product recommendation.

Hair loss is a symptom, not a condition, and the causes need completely different treatment. Iron deficiency, thyroid dysfunction, telogen effluvium after illness or stress, and pattern hair loss all present differently and all have specific answers.

Hair growth treatments covers which treatments have real evidence and, more importantly, which blood tests to ask a GP for before spending anything. Hair loss treatment for women covers the same ground with the specifics women need, including how to be taken seriously at the appointment.

If you’re experiencing sudden, patchy or rapid hair loss, or loss with any pain, itching or scalp change, see a GP rather than starting with products.

Extensions and wigs

Hair extensions and wigs compares every method by cost, wear time and damage risk.

The section worth reading before booking anything is on traction alopecia. Extensions should not hurt. Pain during or after fitting means they’re too tight, and traction damage is permanent once the follicle scars.

The things that help most

Wash less often, with cooler water. Use a microfibre towel or a cotton T-shirt rather than a terry towel. Detangle wet hair with conditioner in, from the ends up. Turn the heat down. Sleep on silk or satin. And if you’re in a hard water area, a shower filter costs less than two bottles of shampoo and solves a problem most people spend years buying products for.