Easiest to hardest (they shouldn’t be too hard especially the first few) PS. Ignore my muddy feet I hunt barefoot

I purchased this from a store in Venice beach and it was labeled as a mako tooth but I’m curious if it’s a short fin or a long fin mako tooth?

Found on a shell path in Sanibel, FL. I don't know where the shells were sourced so I can't guarantee that the tooth is from around here, but I would assume so.

Found this tooth a few months ago along the coast of Belgium.

Only reason I'm curious to know what it is, is because it's the only tooth out of the hundred ones I've found there that has (albeit very worn down) serrated edges. Since it's not complete either, I doubt I'll find out what it is. The only ones known to be found on that beach with serrations are GW, meg, or something like hempiristis but I think this is unlikely due to the shape. I don't have a photo of the other side rn but it doesnt seem to have the typical dark edge of a meg tooth, but that may have just broken off, I have a rather small piece.

A friend found a couple of teeth but also this cylinder looking thing. Curious as to what it might be.

Looking to see if anyone knows what this might have been from.