Holes in my teeth?

So today I discovered a hole beside a filling that’s going under the filling. I was just at the dentist and they didn’t say anything about it. I’m 16, and I do brush and floss twice daily for 2 minutes because I’m really self conscious about my teeth. I don’t understand why I’m getting holes and brown spots on my... show more So today I discovered a hole beside a filling that’s going under the filling. I was just at the dentist and they didn’t say anything about it. I’m 16, and I do brush and floss twice daily for 2 minutes because I’m really self conscious about my teeth. I don’t understand why I’m getting holes and brown spots on my teeth? It started recently and I don’t know what to do. Is there anyway I can repair my teeth? Is there anything I can do about it other than have them put fillings in my teeth?
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