Serie Expert is organised by concern. That is genuinely the better way to sell haircare, but it leaves one gap: a mask that repairs beautifully can also flatten fine hair, and a curl cream sized for coils will drown a wave. This guide comes at the brand from the other direction.
Fine hair
Fine hair's problem is almost never that the products are too weak. It is that they are too heavy.
- Damage on fine hair → Inforcer, not Absolut Repair. Biotin and Vitamin B6 reinforce the fibre without the resurfacing weight, and the Inforcer Mask is the lightest repair mask in the range.
- If you want Absolut Repair anyway → use the Golden Mask rather than the standard mask. It is the lightweight version of the same resurfacing idea.
- Oily roots with fine lengths → Scalp Advanced Anti-Oiliness Shampoo with the clay masque on roots only. Degreased roots read as volume on fine hair.
- Volume → Tecni.Art Full Volume Extra mousse at the roots on damp hair, or Super Dust — 7 g of texture powder that lifts a flat parting in seconds.
Avoid on fine hair: the rich Curl Expression masks, the Mythic Oil range, and any 10-in-1 leave-in applied above the mid-length.
Thick and coarse hair
Thick hair can take the heavy end of the range, and it is the one type where the Absolut Repair Mask and the 500 ml sizes make immediate sense — you will get through them.
- Dry and rough → Absolut Repair Shampoo with the mask, and the 10-in-1 Perfecting Oil through the lengths.
- Frizz on coarse hair → Liss Unlimited plus the Blow-Dry Oil. Coarse hair holds a smooth result longer than fine hair does, so the payoff is bigger.
- The discontinued option → Mythic Oil Shampoo was L'Oréal's nourishing line for thick hair. L'Oréal Professionnel has discontinued it — what is on this page is remaining stock. If it was your shampoo, buy now; if you are choosing today, start on Absolut Repair instead so your routine has a future.
Curly and wavy hair
Curl Expression is the line, and the choice inside it is about how much moisture you can take before your pattern collapses.
- Waves and loose curls (2A–3A) → Moisturizing Cleansing Cream and the Moisturizing Mask — the lighter of the two masks. Style with the Curl Activator Jelly for definition without a cast, or the Tecni.Art Siren Waves cream if you want a soft, undone wave.
- Day-two refresh → the Curl Reviver Water Mist. This is the product wavy hair usually skips and then buys twice.
- Build-up → waves get weighed down faster than coils do. The Anti-Residue Cleansing Jelly once a fortnight is usually the fix, not a lighter conditioner.
Coily and very curly hair
- Cleanse → Moisturizing Cleansing Cream as standard, with the Anti-Residue Cleansing Jelly for reset washes.
- Treat → the Rich Moisturizing Mask — the richer of the two, and the one built for coils. The 500 ml is the sensible size here.
- Leave in → the Intensive Moisturizing Leave-In Cream, then the 10-in-1 Cream-in-Mousse if you prefer one step to two.
The Rich Moisture Nourishing Care Set bundles the coil-strength routine if you would rather buy it in one go than piece it together.
Colour-treated hair
Start with Vitamino Color or Vitamino Color Spectrum — both are formulated to be gentle enough for every wash, which matters more than any single treatment.
Two additions worth making. If you are on hard or well water, Metal Detox Shampoo addresses the cause of colour shift rather than the symptom. And if your colour looks flat rather than faded, the Spectrum Glass Shine Serum does more for perceived colour quality than another mask will.
Between appointments, the Hair Touch Up root concealer sprays cover regrowth for a day — six shades here, from Dark Blonde through Light Brown, Brown, Warm Brown, Auburn and Dark Brown / Black.
Grey, white and silver hair
Silver Shampoo is the line. Violet pigments neutralise the yellow cast; gypsophila extract addresses the wiry texture grey hair often develops. One to two toning washes a week holds the tone — daily use over-tones and can leave a lilac cast on white hair. Follow with the Silver Conditioner, or buy the Silver Toning Duo.
Grey hair is also frequently coarse and dry, so an untinted mask on the alternate washes — the Absolut Repair Golden Mask is a good weight for it — does more for shine than more purple will.
Long hair
Long hair is not a hair type so much as a hair age: the ends are several years older than the roots. Pro Longer is the only Serie Expert line that treats that directly, using Filler-A100 and amino acids to renew the lengths so ends look thicker instead of see-through.
The most efficient way to buy it is the shampoo, the conditioner and the Rinse Treatment. Add the Ends Filler Concentrate — 15 ml of the line's highest Filler-A100 dose, applied to towel-dried ends only — when the tips need more than the routine gives.
Straight hair with nothing wrong with it
If your hair is healthy and you simply want a good professional shampoo, Vitamino Color if you colour and Absolut Repair if you do not are the two safest picks in the range — and both are sold in a 1.5 L back-bar litre that costs roughly what two 500 ml bottles do. That is the cheapest genuinely professional shampoo on this page.
Read next
Our guide by hair concern · the line-by-line comparison · the sizes, litres and refills guide · the Tecni.Art styling guide.