My front teeth seem to be very transparent at the bottom. I understand that front teeth are a little transparent at the bottom, but mine seems a little excessive. The transparency covers around 1/4 of my front teeth. Since polishing my a hygienist they seem more trasparent. They also feel weak, and i can see small lines/fractures on the edges of my front teeth. I'm worried my teeth will continue to fracture, and eventually chip or break off. I'm only 18 years old. Thanks for any help!