hi dr, i was just wondering if you could help me? i have a cosmetic filling on my front tooth. it has been broken since i was 10. the filling is now starting to get old and the change is starting to show. i am now 19 and when i asked my doctor to simply change it he said that it cannot be done and the only way to repair is by a crown. i’ve been highly discouraged for that solution because i don’t want to file my whole tooth for a small piece that would become more unstable than my current filling. is there any other solution you may recommend?

p.s. : I am thinking about taking up a boxing class, would it be safe if i used a mouth guard? Thank you for the help.