Chicken thigh(bone-in) used in chicken sandwich . Bitting it I almost broke a tooth. Receipt shows no thigh purchased, pictures taken. Legal recourse?

Almost every civil claim requires money damages, i.e. the money you lost due to the other party's wrongdoing.  It's not like a criminal prosecution where attempted murder or burglary, etc. is just as much of a crime as a succesful murder, burglary, etc.  If you had actually broken a tooth, you might have a case for the sost of the dental work, and maybe for pain and suffering,  As it is, all you've lost is, arguably, the price you paid for hte chicken.