Possible dino or mammal tooth?

[bluewavegirl]

We found this in a riverbed and wonder if it’s a tooth or a bone. There are two pieces we wonder about. 

[Brevicollis]

Hello, 

I'm sorry to dissapoint, but both pieces dont appear like teeth to me 

 

The first rock appears like a normal rock with some mineral inclusions/staining on it, whereas the second one appears like an ironstone concretion to me.

 

There is no enamel, or tooth morphology on them, that would match any mammal or dinosaur tooth I know of.

[Moth.11]

Interesting rock possibly. No teeth

[Fossildude19]

No teeth or bones, unfortunately.