Abstract: The present invention relates to a process for treating human keratin fibres such as the hair, which comprises: i) a step of applying to the human keratin fibres a composition comprising: —at least one plant wax: —at least 60% by weight of water relative to the total weight of the composition; ii) followed by a step of heating the keratin fibres by means of a heating appliance at a temperature ranging from 80° C. to 160° C., preferably from 110° C. to 50° C., more preferably from 120° C. to 150° C., which is moved along the fibres, iii) optionally followed by a step of rinsing the keratin fibres.

Abstract: The present invention relates to cosmetic compositions containing a biotin compound and/or a complexing agent, one and/or the other bearing at least one reactive chemical function allowing covalent attachment to the hair, at least one cosmetic active agent being covalently attached to one of these two compounds, or to both of them.