Hair removal creams contain sulfur compounds which break down the disulfide bonds in hair. The occuring chemical reaction is more or less comparable with the first step of perming.
Hair becomes extremely brittle during this procedure, so that you can scrape it off from your skin only with a spatula.
It really depends. There are several factors that will affect the hair removal creams you choose. You should alway ask these questions before buying the cream.
The first question is: do I have sensitive or normal skin?
Then, you should ask: is my hair tough and thick or is it thin and soft hair.