This is a tooth. It came from some animal's mouth. If you think it's disgusting to hold something that's been in someone's mouth, you must not eat eggs.
In Terry Pratchett's Discworld book Soul Music, the troll Lias Bluestone (Cliff) removes a diamond tooth to pay an old lady at a magical thrift shop for a guitar. When the dwarf Glod Glodson gives it to her she says "I'm not taking that... It's been in a troll's mouth!" to which Glod replies "You eat eggs, don't you?"
