What is the substance that your nails are made of

Our nails are made of keratin. Keratin is composed by dead cells. It is also the major protein in the hair. Since it's made of dead cells, it doesn't hurt at all when you cut your hair or your nails. The fingernails grow faster than the toenails. Also, men's nails grow much faster than women's. It's because of the different hormones between men and women.

You should only go in for less than 10 minutes at a time, or avoid them altogether, especially in the early weeks. studies have shown an increased risk for birth defects in babies of women who had an elevated temperature before 7 weeks of  pregnancy.