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A helpful, step-by-step guide to doing a monthly skin check and tracking any changes in your moles.

Calcium is a mineral that helps us make strong bones and teeth. We spend 25 to 30 years building to a peak bone mass. Taking in enough calcium helps younger people build strong bones. Maintaining a safe calcium level helps older people limit bone loss.

Vitamin C is also called ascorbic acid and ascorbate. This vitamin has many benefits. Vitamin C is an antioxidant. This means that it fights cell damage in the body. Damaged cells increase the risk of cancer and heart disease. Vitamin C may help you resist these diseases.

Learn about the drug addiction process in teens.

The middle ear is an air-filled chamber that lies behind the eardrum. Pressure in the middle ear changes to match air pressure outside of the eardrum. When inside and outside pressures are balanced, the eardrum is flexible and normal hearing is more likely. Problems happen when air pressure in the middle ear drops. This is often due to a block in the eustachian (u-STA-shun) tube, the narrow channel connecting the ear with the back of the throat.

Diagnosing a middle ear problem takes several steps. You may be asked questions about your child's health history. Your child's eardrums will be examined. Tests may also be done. Read on to learn what you can expect.

Periodontal disease is an infection of the gums and tissues supporting the teeth. If not treated, it often gets worse. Bone damage and tooth loss can occur. Regular self-care and dental visits can help prevent or control periodontal disease.

Ureteroscopic stone removal may be done before, after, or instead of other treatments. If you need this procedure, your doctor will discuss its risks and possible complications. You will be told how to prepare. And you will be told about anesthesia.

To fuse the spine, very small pieces of extra bone are needed. Called bone graft, this bone acts as the “cement” that fuses the vertebrae together. This eliminates motion between the two fused vertebrae with a slight loss in flexibility. This surgery can help treat many different back conditions.