i'd talk to the brown belt about what happened.
Let him know(if he doesn't already know) ur tooth chipped because of his elbow the other night.
I would say it in a pc, objective way; not in a accusatory way.
He if doesn't apologize, he's a prick. I would then stress that injury costed you $1,250 for the crown.
After that, I would speak to the head instructor and kindy request your contract to be terminated.
Your reason is:
1st -Your brown belt assistant instructor was negligent(sp?) in the safety of it's students. Students
accidentally injuring other students is understandable when participating any physical sport, esp in MA.
(We all signed some form of waiver understanding this; and that the school is not liable.)
Injury as a result from any member of the staff, esp the assistant instructor, is unacceptable.
2nd -Adding insult to injury, this instructor did not express concern for it's student after the injury.
After explaining to him what had objectively happened, he still has not apologized. As a result, you
are concerned about your future safety if you continue to train at this school. You thereby wish to
terminate your contract.
I don't think you can sue for that crown, but if presented properly, I don't see why you can't get out
of your contract.