Rotten Black Teeth
A date with someone who has been convicted of a crime does not tend to go smoothly, as Heather experienced. The entire date was unusual, and it appeared that Heather felt uncomfortable the whole time. This is likely due in part to the state of his teeth, which were decaying.

Perhaps he should have brushed his teeth more thoroughly and rinsed his mouth out with mouthwash. That would certainly have fixed the problem. He didn’t even bother to pay attention to his personal hygiene, which is a clear warning sign. It was probably a good idea for Heather to bring gum or mints along in order to offer them to him, but she neglected to do so.