A device usable as an applicator comb, comprising a collection of applicator teeth inserted into a tubular body (1) as supporting element, permitting liquid or gelatinous products to be applied precisely and economically, by having attached to the device a container or receptacle holding the treatment product. For hair and scalp treatment, the product enters the applicator teeth (2, 2I, 2II, 2III, 2IV, 2V. The product to be applied may cover all, only the sides or only the base of the applicator teeth, depending on whether the treatment is to be given on the totality of the hair and scalp, only on the hair, or on the base of the hair and in the scalp. Depending on the application, the tooth structure has a rigid core constituting the support for a permeable, peripheral cladding (13), or only a lateral cladding (12), without reaching the end.