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T-Rex teeth

> They touched on the subject of T-Rex's powerful arms and massive jaws. The
> possibility they mentioned was the arms were used to somehow hold the prey.
> The rationale they used was if a T-Rex bit into something like... say... a
> triceratops, the tric' might rip out the T-Rex's teeth while trying to
> escape.

How were a T-rex' teeth arranged?  Was it like a shark, which has a row of 
front teeth which are easily ripped out when it bites, but has 2 or 3 rows 
of nascent teeth which quickly grow to replace them?  Or once gone, were 
they gone forever?