Review (4/5): Smooths frizz but does not straighten hair.
I have frizzy hair and it makes my waves more curly after I wash my hair. I used this brush and the negative ions seemed to smoothen the frizz a little, my hair was still wavy but slightly less frizzy. It is definitely not a replacement for a flattening iron, if that is what you are looking for. It works to reduce frizz on dry hair.