This can be a sign of pain,or annoyance,irritation.Maybe you could loke at the behaviour that accompanies or surrounds this behaviour,of teeth grinding.If you are at all concerned about your piggie maybe a trip to the vet may help.I hope you are able to find the cause of teeth grinding.
I don't know about piggies annoying him. I have 3 piggies on 1 side & just him on the other. He was neutered, 9 days ago so I can't let him in with the sows. He even does it on laptime & he never has before.
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