I had a similar incident with my little guy. I started putting a collar with a bell on him so that we can hear him when he walks around. These little guys are so quiet when they get under your feet, so the bell was working out well for the first little while.
Anyways, the ONE time that I forgot to take off his collar at night, he started banging around his crate and crying. I checked to see what was wrong and he had gotten his tooth stuck between the slits in the bell
I tried to pull it out but he freaked out and wouldn't let me near it. I called the emergancy vet and as I was explaining the situation to her, he had managed to get his tooth out of the bell by himself. The little ball was still inside the bell, but I still wondered if the bell had more than one ball in there? I was in such panick mode that I didn't even think of cutting his collar off (which is what I should've done right away!). The bell would've still been stuck on his tooth, but atleast there wouldn't have been any stress on his neck. The whole situation was so scary!