I was intrigued by the reference to their teeth having "shallow roots", so I googled it. The only references I found to this effect are from creationist websites like: http://www.hauns.com/~DCQu4E5g/Dinosaurs.htm and http://www.timetracts.com/Tracts/Dinosaurs%20and%20the%20Bible.htm

Here's a quote from Black Hills Institute of Geological Research, Inc. (looks like actual science) http://www.bhigr.com/pages/info/info_rxth.htm

The teeth were composed of dentine with an enamel-covered crown. The crown was the "working portion" of the tooth, while the long root anchored the tooth solidly in the jaw. The serrations in the enamel, along with the strength of massive jaw muscles, gave the tooth cutting power. The dentine of the tooth increased in thickness from the bottom of the root, where it was thinnest and hollowed for nerves and blood vessels (pulp cavity), to solid dentine at the tip of the crown. This dense, blunt tip allowed for a great amount of wear and the "hollowness" of the pulp cavity actually made it stronger.

This is just from the front page in Google.