The answer depends on your hair. They might need 5 drops.
The quantity varies depending on the length and weight of your hair. The secret is to apply the oil drop after drop and applying it in a homogenous way on all your hair. After a couple of use you will know the perfect quantity needed for your hair.

Our hair is exposed daily to pollution, sun, heat…Applying Le Concentré before washing your hair acts like a preventive and conditioning treatment, but also a protective one. In other words, it aims to reduce the dryness of the hair, cleanse and nourish the scalp, limit split ends, soften the hair and as a result, facilitate disentangling. You can apply to dry or damp hair. Separate your hair into 4 or 6 section, then moisten it with lukewarm water, which swill have the effect of opening the scales of the hair and get it ready to better absorb the oil. Then all that is left to do it to apply Le Concentré on your hair and massage your scalp. You can leave it on for as long as you like but we advise you to keep it for at least 10 min. Rinse it off with lukewarm water and wash it off with a sulfate-free shampoo.

Massaging your scalp regularly will help your hair gain length and mass. Scalp massage activates blood circulation in the hair follicles and therefore promotes growth. In addition to offering, you a moment of relaxation, our Gua Sha comb is a precious but very practical tool. It fits into a minimal and efficient routine.
3 minutes a day, 3 times a week, ensures a perfect oxygenation of the scalp as well as capillary anchoring.
The massage reduces tension, unclogs residues accumulated in the scalp and promotes healthy hair growth.

Oily hair also needs nourishment; thus, the application of the oil will be of great benefit. To avoid weighing down your hair, simply apply the oil to dry lengths and ends, avoiding the roots.
Your lengths will be nourished and plumped.

You should avoid applying Le Concentré to damp hair just before getting a brushing or blow drying it.
If the heat is too high, the oil can “cook” the hair and damage it. Instead, apply your hair oil as a finish touch to soften the lengths and make them shine.