It's a homeopathical trickConsider your 8 fingers except thumb finger;scratch your right hand 4 fingers with left hand 4 fingers then again your left hand 4 fingers with right hand 4 fingers.
Lack of some minerals and/or vitamins, well if you have a comb i would sujust you move to a different kind of brush i used to use boreing old fronisie now that ive switched to loconvigouse it has...
Putting alot of heat on your head is damaging period. If you are talking about pressing your head with a ironing comb, that is worse damage of all because you are frying your head. If you are African...