From Hair on the Brain:

“There’s a growing body of research showing that people with red hair need larger doses of anesthesia and often are resistant to local pain blockers like Novocaine. As a result, redheads tend to be particularly nervous about dental procedures and are twice as likely to avoid going to the dentist as people with other hair colors, according to new research published in The Journal of the American Dental Association. . . .Researchers believe redheads are more sensitive to pain because of a mutation in a gene that affects hair color.

. . . A 2004 study showed that redheads require, on average, about 20 percent more general anesthesia than people with dark hair or blond coloring. And in 2005, researchers found that redheads are more resistant to the effects of local anesthesia, such as the numbing drugs used by dentists.”

“THIS TOTALLY EXPLAINS EVERYTHING,” I thought to myself. “Lately I need nitrous just to walk INTO the dentist’s office.”

And then…”Jenny, you are a f*cking idiot. You’re not a natural red head.”

Stoopid.