Hair straightener brush uses a unique Heatproof Comb Tooth Design, which allows you to straighten your hair while combing hair and not worry about being burned like a traditional straightener. It is composed of a double-layer 3D tooth comb. The inner part is a ceramic heating tooth comb which generates even and stable heat without damage the hair; the outer part is an anti-scald tooth comb to avoid contact with the heating body, and the flame-retardant plastic frame protects you from all angles