Recommended [SEP] I've been very happy with this brush.  My hair has always been thin, but since it has started getting more gray, it has become more dry & coarse. I've been using a flat iron to smooth it out and get rid of the kinky nature.  This has worked great for me instead.  I wash it, dry it, and then just brush.  One word of caution, the nubs are very hot, so you can put your hand over them, also, your hair will be warm for a few seconds after you brush thru it.  I discovered I could use a dry wash cloth or heat resistant glove to assist in keeping  my hair against the warming surface.  As I place the brush under my hair & brush downward, I place my other hand (protected by cloth or glove) over the nubs, thereby holding the hair tight against the surface.  The smoothing effect is great without any burning of the hair like with a straight iron.  We also used it on my mixed race granddaughter whose hair is much thicker and kinkier.  It took a little longer than it did on me, but it did smooth her hair faster than with a hot iron.