I am going in for Zoom Teeth Whitening tomorrow but now I am getting a bit worried as I have fairly thin enamel (my dentist back at home recommended me to use anti-erosion tooth paste). I am only 22 years old and have never had anything besides the yearly cleaning done to my teeth, but there are very small slightly darker vertical "stripes" on the bottom of my two front teeth where the enamel is thinner. Could this be an issue?