Just like many other things that are effected by genetics, so is hair growth. It is told that genetics determines how a person's hair grows by length, thickness, and color. Unfortunately, there are some things that put genetics at question. These few things can be from coloring or getting your hair done. When your hair grows naturally, then it is all genetics. When you add heat or change the color it then hair growth is not about genetics anymore. In addition, once you mess with your hair in any way, it is very hard to get it back the way it was in the beginning. Another thing that effects hair growth are stress, physical activity, and hair care. Yes, there might be all these factors that may change our hair growth, but genetics is the more dominate factor.