In cosmetics are used many organic compounds (comtaining C, O, H, N, S).
Inorganic compounds: talc, titanium dioxide, zinc oxide etc.
There is no set amount of time, as long as you keep your requirements up to date. For example, in some states you need to pass the NCE given by the NCBTMB or the MBLEx given by the FSMTB.
No because they are both major programs you will have to do one at a time if i was you I would take up cosmetology first since it takes only about a year and a half and make money on the side to get you through medical school if thats an option for you. I hope my answer has helped you out.
Every state is different...in Il it's the odd year every other year and the teachin license it's every other year but in the even year.