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Gum tissue and bones surround and support the teeth. Healthy gums and strong bones hold the teeth firmly in place.

Melanoma is the most serious type of skin cancer. The most important warning sign of melanoma is a change in the size, shape, or

The immune system is the body's natural defense system that helps fight infections. The immune system includes the following. The

A neuron is a nerve cell. Neurons send information to and from your brain to the rest of your body. A neuron is made up of: A cell

The spine (backbone) is a column of bones (vertebrae) stacked on top of one another. Each vertebra has an opening near its center

When the spinal canal in the low back becomes narrower (stenosis), the nerve roots get squeezed.

Blocked or narrowed airways in your nose, mouth, or throat can cause sleep apnea. Your airway can become narrowed when your throat

Varicose veins are caused by weakened valves and veins in your legs. Normally, one-way valves in your veins keep blood flowing

Scabies mites cause a rash and sometimes skin sores in a line or curved track. These often appear after a period of intense

Melanoma is the most serious type of skin cancer. The most important warning sign of melanoma is a change in the size, shape, or