Rotten Black Teeth
When your prospective date is a person who has been convicted of a crime, things may not always go as planned during the date. We have reason to believe that Heather was uneasy the entire time she was with the gentleman, in addition to the fact that the date itself was very odd. Especially considering the state of his decaying teeth.
Perhaps he should have brushed his teeth more thoroughly and rinsed his mouth out with mouthwash. That unquestionably would have resolved the issue. However, he didn’t even bother to pay attention to his own hygiene, which is an obvious red flag. It was probably a good idea for Heather to bring some gum or mints to offer to him, but she forgot to do so.