Can I sue if I broke a tooth at a burger restaurant and what can I do if I did all proper steps but they haven’t responded back?

It depends on what caused the broken tooth. If a person breaks a tooth because of a cherry pit in a cherry pie, there is no liability due to the foreseeability of a pit in a cherry. However, a stone in a cherry pie is not foreseeable.

Yes, you can sue. Keep your receipt and get an estimate for the cost of a cap. If you have the offending foreign object that you bit on, keep that a well.