Because, you know, everyone needs to pay a visit to the dentist sometimes, especially villains like Skeletor, who want to keep their evil-looking grin in good shape at all time.
Hit the link for a picture of He-Man getting a haircut.
[Link] [Edit: Somehow, the link doesn’t work for a lot of people. To make it work, after clicking the link, put your cursor at the end of the url in the address bar and hit enter]