Term

Diffuser

A diffuser is a dryer attachment that spreads airflow gently to enhance waves and curls without disturbing them. It matters for wavy and permed looks, where a direct blast of air can create frizz and break up the pattern. A typical routine is to cup sections of damp hair in the diffuser on low heat and avoid touching it until dry. It can also add lift at the roots. It is not needed for straight styles. See also: Perm, Root lift, Heat protectant, and the guide Soft Wavy Perm Styles: What to Know Before You Book.