There's probably no one better positioned to spot toupees than a dentist! Also, whenever I go to the dentist, I fret about having it fall off. After all, you're tilted almost upside down, sometimes perspiring as the malevolent dentist inflicts pain on your mouth. I'm always very careful to put fresh new tape on before a dentist visit. Every time the dentist turns away for a minute, I quickly press it down hard, just in case the tape is weakening.
This isn't leading up to an embarrassing story, just reflections caused my my recent visit to the dentist.