Honestly. I think it's probably the best videogame movie I've seen (that I can recall off the top of my head) second only to the first RE movie. Sure, the dialogue was suspect at times, but what were people expecting? Othello??
I'm guessing inside joke. I mean, I know doctors who smoke and don't eat healthy, so it's not that much of a stretch for an older dentist to have crooked teeth.
I don't think that's the route he's trying to go here. He's just trying to illustrate that these guys would never show up to back their facts up in person.