The question of whether a dentist can tell if someone performs oral sex is a common concern, particularly among those who engage in such activity. While there is no definitive answer, some indicators may suggest that a person has recently engaged in oral sex.
One potential indicator is the presence of small red or purple spots on the roof of the mouth or the back of the throat. These spots, known as petechiae, can occur due to the increased blood flow and pressure associated with oral sex. However, it's important to note that petechiae can also be caused by other factors, such as coughing, vomiting, or certain medical conditions.