Fangs
He has them and isn't afraid to show them.
The horror
Originally assumed to be yellowish as a result of poor video quality, it is more recently theorized that Chris's fangs are yellowing as a result of the copious amounts of soda he drinks[1]. The fact that he has multiple visible cavities seems to support this, although Chris could just be far too lazy to brush his teeth. What IS certain is that the inside of his mouth is just as even more horrifying than the outside.
Powers
Chris revealed his fangs by essentially jamming his mouth in the camera. For some reason he thinks this is an effective method of intimidating his enemy. It works, but reasons other than Chris had intended. Close-ups of Chris's face have always caused people to back away in horror. His mouth is no exception. What he intended to demonstrate is uncertain. Perhaps he hoped his tormentors would fear being bitten. Though this scenario has yet to take place, the resulting wound would no doubt bestow the recipient with a horrifying disease. So in that respect, they are kind of scary. Or would be if he weren't too housebound to use them.
Wisdom teeth
Chris has had an operation to remove his wisdom teeth. He keeps them in a jar on top of the Megan Shrine and also made a Yu-Gi-Oh card with them on it.
He's not even afraid to show the gaping cavities at the back of his mouth. Now that's honest content!