The present invention relates to a cosmetic hair treatment method comprising at least the steps consisting of: a) applying a mechanical tension to said hair, b) exposing said hair under mechanical tension to microwaves, in the presence of a solvent in vapor form in contact with said hair, without complete drying of the hair during microwave exposure, the solvent in vapor form being entirely generated by the evaporation of a compound which is present, before emission of the microwaves, in contact with the treated hair.本発明は、化粧的毛髪処理方法において、ａ）機械的緊張を毛髪に適用すること、ｂ）該毛髪と接触している蒸気の形の溶媒の存在において、機械的緊張下の該毛髪をマイクロ波に暴露すること、ここで、マイクロ波への暴露の間、該毛髪の完全な乾燥はなく、該蒸気の形の溶媒は、処理される毛髪と接触してマイクロ波の放射の前に存在する化合物の蒸発により専ら発生される、を含む、前記方法に関する。【選択図】図３
