The process of the invention provides for a preventive hair treatment with buffering agent, in particular glyoxylic acid in combination with mechanical straightening with hair straightening iron at temperature of approximately 200° C.+/−50° C.本発明の方法においては、緩衝剤(特にグリオキシル酸)を用いた予防的毛髪処理と、約200℃±50℃の温度での毛髪矯正アイロンを用いた機械的矯正とを組み合わせる。【選択図】なし