Behira has a tendency to strike the acrylic doors to her tank when hungry (hence putting a drape up).
She bent a few teeth, but never got one caught on her lip.
I agree with Richardhind1972; probably just caught on her lip. See if you can gently unhook it.
If the tooth is bent, it will likely fall out on it's own soon or at next feeding. That's what happened with Behira's bent teeth.
Also, if you want advice on preventing the striking at the front of the tank, just ask. I can link you to Behira's thread. There was a whole decision on that and I ultimately put up a drape, which solved 95% of it. Occasionally, she still nails the doors when I am about to feed, but even there, I have found a few tricks.
Good luck.
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