Dinosaur teeth from Liaoning, China?

[Crazyhen]

The teeth below are said to be dinosaur teeth from Liaoning, China.  Are they dinosaur teeth or teeth of marine reptiles?

[Pterygotus]

These look like marine reptile teeth to me.

[Troodon]

Nothing jumps out and says dinosaurian, no serrations visible on any.   The first one does looks marine.  The second could be pterosaur.   The last one has some dino shape but to difficult tell with poor preservation and lack of visible serrations