Q. I have a craze line in one of my top front teeth. It is a long vertical line. It is really noticeable when the sun hits it, or under a bright light. Is there anything to do 2 fix this or is it better to leave it? It bothers me a lot by the way it looks. Also how often do you see this as a dentist? How many patients do you get with a craze on one of their two front top teeth? I know it is common in other teeth I just do not notice it with anyone else. Plus I am just 22 years old. How common is this in someone my age? In the two top front teeth in particular? Thanks for your time!