Why do dead skin cells fall off your body? — Megan of Dyersburg, TN

Dear Megan,

The top layer of skin is called the epidermis. The outermost cells of this layer have died, forming a protective covering for the body. Humans lose billions of these dead skin cells every day as they go about their activities, but there's no need to worry. The innermost layer of the epidermis continually produces new cells to replace those that are lost.

While losing all those skin cells might seem a little gross, it serves an important purpose: since new cells are being produced, the skin is kept healthy. Also, it allows for dirt and stains to be removed from the skin to keep it clean.