Put simply, a hairdryer diffuser is a round, plastic attachment that you can slide onto the nozzle of your hairdryer. A diffuser works by spreading the airstream over a wider area in a more controlled way. Diffusers are great for those with curly to wavy hair types as it can help to keep the natural curl pattern.

Is a diffuser better for your hair?

"The benefits of using a diffuser are faster drying time, and bouncier, fuller, voluminous curls," Emilio says. "Diffusers diffuse the air, aka, they disperse it, which means it prevents the dryer from roughening up the cuticle of the hair. It protects curls from frizz."

Is diffusing your hair bad?

Diffusing reduces heat damage but can't nullify it completely as it's connected to a hair dryer. ... Even if you use a diffuser, if the hairdryer is on high heat, it will most definitely cause heat damage. Diffusing daily can be very damaging. You should only do it a few times a week.