I would not say it is ''entirely'' an OCD problem.
This sounds clearly a dental problem.
If it were me (and I have been in such a situation), I would be keeping a close check on it. We have to eat, drink, breath, talk through the mouth. Quite a busy place is the mouth, hence a lot of checking going on. Of course I keep a regular check on what is going on in there. Would anyone want to swallow part of a tooth that cracked off? No thanks!
Take extra care until you see the Dentist.