I have got 2 white marks on my front two teeth?!

I have got 2 white marks on my front two teeth?

i have had it most my life, and now its getting to me ( i am 16) i brush my teeth everyday, i am scared girls might think its because i dont brush. Help! thanks.

It is just where the enamal of those teeth have been impervious to stains, or where the whitening toothpaste has done more work. I also have several small spots on my teeth from it. I don't worry about and sometimes wish that the rest of my teeth were that color.