1. Dry

Healthy hair should stretch up to 30% of its length before snapping. But if your hair is heat-damaged and dry, it will break under tension.

Your SOS kit

Khairpep Transforme Masque, £47.50, promises a 120% improvement in elasticity from the first treatment.

Ghd Advanced Split End Therapy, £19.95, ghdhair.com, seals splayed ends so hair looks smoother for up to 10 washes.

Tresemmé Heat Defence Styling Spray, £5.50, is a must if you love your heated tools, providing protection up to 230°C.

2. Frizzy

On a healthy length of hair, the cuticle scales lie flat and smooth. Damaged hair, however, has lifted cuticles so that moisture can seep in and cause frizz.

Your SOS kit

Charles Worthington Smooth & Control Finishing Serum, £6.99, offers lasting sleekness. Apply a blob to damp hair and another blob once dry to seal in smoothness.

Living Proof No Frizz Humidity Shield, £22, M&S, defends against moisture in the atmosphere, like an invisible brolly.

3. Coloured

Shampooing roughs up the cuticle, rinsing the colour away. Try to space out your washes and switch to products for coloured hair.

Your SOS kit

Color Wow Security Shampoo, £16.50, colorwowhair.com, has taken out all the ingredients that can leave a dull film, so your colour stays bright and glossy for longer.

Klorane Dry Shampoo, £8, mops up excess oil at the roots to delay your hair wash for one more day.

John Frieda Visibly Deeper Colour Deepening Treatment, £9.99, is used once a week to restore a rich depth to coloured brunette hair, which can fade.

4. Flat

Naturally fine and straight hair can lack volume, so embrace thickening treatments and try backcombing gently at the roots.

Your SOS kit

Pantene Pro-V Foam Conditioner Extra Volume, £3, is an airy whip that delivers all the nourishment you expect without weighing hair down.

Plantur 39 Phyto-Caffeine Shampoo, £9.75 RRP, plantur39.co.uk, deeply cleanses dirt and product build-up, and helps post-menopausal hair retain its volume.

Bumble And Bumble Full Form Mousse, £23, adds lift and body. Squirt a golf ball-sized amount into the palm of your hand and rake through just-washed hair.

5. Itchy scalp

Treat your scalp with the same TLC as your face. If yours feels sensitive, switch to an anti-dandruff shampoo or something for sensitive skin.

Your SOS kit

L’Oréal Paris Elvive Phytoclear 1 Min Exfoliating Scrub, £5.99, Superdrug, stimulates blood flow and removes impurities.

Philip Kingsley Flaky/Itchy Scalp Toner, £20.50, philipkingsley.co.uk, feels instantly soothing.

Head & Shoulders Nourishing Care Shampoo, £2.99, is gentle on sensitive scalps, moisturising dry areas.

6. Lacklustre

In summer, the sun should be bouncing off your shiny hair but damaged locks just don’t reflect light as well as they should due to rough cuticles.

Your SOS kit

Lee Stafford Arganoil from Morocco Miracle Shine Spray, £9.99, is infused with argan oil to finish off your style.

Remington Shine Therapy Hair Straightener, £79.99, leaves hair tantalisingly straight. Ironing your hair helps ruffled cuticles lie flat, so it looks extra glossy.

Umberto Giannini Spoil Me Hair Oil, £8, can be used on damp hair before drying, or on styled hair to add shine.