By the way, doctor: How does Thermage remove wrinkles?

Q. Can you tell me anything about a new cosmetic treatment called Thermage?

A. Thermage is a technology that uses heating and cooling to tighten skin and reduce wrinkles. In 2001, the FDA approved it for treating forehead wrinkles and fine lines around the eyes. It's also approved for treating sagging jowls and cheeks.

Skin is composed of several layers. The outer layer is the epidermis. Just beneath it is a thicker layer called the dermis. Below the dermis lies a layer of fat, and under that, muscle tissue. The dermis is composed of collagen proteins arranged in parallel layers of fiber called fibrils; these form a matrix that holds skin together. As we age, the fibril layers loosen and become less organized, resulting in sagging skin.

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