When those teeth come in, they hurt! I'm not sure if Jack's got "adult" teeth coming in or if these are still some of the late missing "baby" teeth. Either way, they look they are pushing on the teeth he has. We'll be going to the dentist. It's one medical professional we've sort of put off. After all, he's seen just about everybody else. In the meantime, vibrating teething toys will be chewed upon while doing computer "work".