When you take a girl with braces, put her stomach down and naked on the bed and tie her hands behind her back. You then proceed to have her perform oral sex on you. While she is doing this, you smack her on the ass with a paddle. Her hands move like the dorsal fin, her legs move like the tail fin, and she bites down on your penis (hence the bite). The "shark" part of the bite comes from the James Bond movie where the character named "Jaws" wore braces.
Damn my dick hurts!!! I met this cutie in Mexico during spring break. I had to ask her for her ID because she had braces. I got a great shark bite that night!!!!