Now, I've never found a tooth or anything similar in a sewing machine, but my husband found a whole set of dentures in the attic of a house he was working on one time. We later found out that someone had died working in the attic during the hot summer weather! Oh, my. Suffice it to say, we certainly didn't keep those! I think we trashed them! It's been a lot of years ago!
Jeanette