Shark Teeth, maybe not

[Rainaj77]

Even tho we've lived in Florida for over 15 years, this weekend was the first time we actually went looking for shark teeth. And then again today. 

 

I confess, once I started flipping these over and looking closely, I've answered most of my own questions. Especially in light instead of quickly fading dusk! The first pic are the 2 I'm certain are real now. In particular the grey one. Next 4 are one I'm not sure about. But if I'm wrong about any others being rocks or shells please let me know! Thanks!

[Fossildude19]

Most of these are bits of shells or phosphate/matrix nodules. 

I only see the one shark tooth. The white one may be a shark tooth, but if so, it is modern. 

I'm not entirely convinced it is a tooth, however. Looks like a shell, and - no root texture to the top of it.