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B. One Reason Why Botox is So Popular . . .

Narrator: This is Science Today. The popularity of Botox, an injectable cosmetic treatment that erases lines on the forehead, is on the rise. Dr. Richard Glogau, a University of California, San Francisco dermatologist, says one of the main reasons for its gain in popularity is it effectively erases certain expression lines on the face that carry what he calls a tremendous amount of 'emotional content'.

Glogau: And those vertical lines between the eyebrows are at the top of the list. They make you look angry, they make you look tired, they make you look worn out, even when you don't feel that way.

Narrator: Glogau says these particular expression lines really can affect a person's interpersonal relationships.

Glogau: It's not well stated, but that's really fundamentally why the material is so popular. It's not really a question of just getting rid of lines and erasing wrinkles. It impacts the way people relate to you and patients don't generally understand that, but they very quickly come to the sense that it's different and getting that without surgery is really the big appeal. That's really what's pushing this drug.

Narrator: For Science Today, I'm Larissa Branin.