This is sort of related [promise] but when I was in my teens I qualified as a dental nurse. Those were the days when we could take impressions, take x-rays and suture up after surgery.
We were taught by two very much 'maiden aunt' lecturers and there are various ways to 'chart' a mouth. In quadrants to start with - the mesial is the part of the tooth cloesest to the midline of the mouth, the distal is the part of the tooth to the back of the mouth etc etc.
We were taught that side of the tooth is the buccal area and the front of the tooth is the 'labial' area. So the front of the incisors is the labial area.
I had nooooo idea this described another part of the female anatomy.
To keep things polite these days the front of the incisors is called 'the buccal region'
In my first job with a male dentist with a male patient I patiently corrected him when he was charting a cavity on the front of an incisor "It is called the labial region not the buccal". It went very, very quiet in the surgery
He put mt straight at lunchtime and I will never forgive those bloody iron knickered virgins who taught me 