I always liked those drilled sharks teeth you have found. I have looked a lot over the years in Florida and never found a drilled sharks tooth. I found these photos and a found a whole different use for drilled sharks teeth than what I ever imagined. I thought they wore them as necklaces.
That is very cool isn't it?!
I have looked at some of those.
I also have some that have evidence of use and cord marks.
The only one I ever gave as a gift in a trade went to CapSmith ..that one had some good wear marks extending out from both sides of the drill hole.
I think some may have been used as tools for incising pottery.
I also have one that the root was trimmed on both sides..as if to fit in a slot.
Thanks for posting this.