By massaging at the roots: this is the best way to distribute the shampoo, just at the base of the hair. Start with circular pressures—test cleanliness by lightly gliding fingers over hair. You should hear screeching. Then distribute the foam, gently kneading everything together before rinsing.
By pressing: after distributing your mask on the hair away from the roots, push the lengths to facilitate the penetration of the active ingredients.
By smoothing: do it with your fingers rather than with a comb to roughly detangle and concentrate the product on the ends, where the hair is more fragile.