On the back of my top row teeth, I observed there is a little strip in yellow color and worse is, there is a hole in it but it's not really that big. How can I get it off? Last month was my last check up with a dentist and she never mentioned anything about it. I am very conscious with my oral and dental hygiene so I got worried after seeing this teeth problem I have. Do you think I drink, eat something that caused this? So I won't try eating or drinking it again. What solution I must consider? Help guys. Thanks in advance!