I found a tooth

Today when going on my afternoon snorkel, I happened to find something that appeared to be a tooth.  I picked it up, because I was considering bringing it to my older brother who is currently in dental school(I gave him rabbit teeth for his birthday so it would continue the joke).  I stuck it in my dive skin to bring it along with me, however, by the time I got out it had been lost.  Guess he's not getting a souvenir from this trip!