Generally, these brushes aren't ideal as they are made out of plastic. While they may not be as damaging as other plastic bristle brushes that contain bobble heads, they certainly aren't as safe as wooden or boar bristle brushes. Plastic bristles have a lot more irregularities that will catch on the hair, rough up the cuticle and pull on your follicles, all of which can cause much more breakage and split ends! These brushes do tend to be spikier for your scalp too, which can cause some discomfort and surface damage overtime.