Check this out and tell me what you think it is

I bid and won another storage locker last month. It was a 10 x20 unit, got it for $100. The renter had been paying on this unit for at least 15 years according to the landlord.

Anyway, two trips to the dump, two loads to Goodwill, and a few boxes of stuff for my wife to sell in her shop. Among the few things I found to keep for myself, was this petrified looking TOOTH! I have no idea what it is from. Dinosaur? Great white shark? Here is a picture, I'm holding it so you can get an idea of scale / size. Any ideas what this is?

How long is that tooth, just out of curiosity? Judging from the picture, maybe 4-5 inches?