"Anything with a mouth can and will bite. Most of the time an iguana will give warning when it's about to bite. This doesn't mean that it will aways warn, or that the clues are so obvious you will have immediate warning. You might not understand the clue, or it might be too subtle for you to pick up. But the short answer is; yes, iguanas are capable of inflicting serious bite wounds. They have extremely sharp teeth and powerful jaws. They can adjust the degree of strength they apply to a bite. So one time it might be a soft bite that barely draws pinpricks of blood. Or it might deliver a bite that will require a trip to urgent care, and possibly stitches. Untamed and unsocialized iguanas are not to be trusted with bare fingers and the use of heavy-duty leather gloves is recommended when handling one.

Iguanas have anywhere from 80-120 small, sharp serrated teeth. Think of a steak knife bent in half with the serrated edges on the outside. Sometimes, when you are hand feeding your iguana a nice big piece of Collard green, he will accidentally scrape your finger. Hardly a major wound, but it will draw blood nonetheless"