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An abnormally curved upper back, or dowager's hump, develops when the bones of the upper spine (vertebrae) become thin and brittle

Flashes of light are "sparks" that you may see when you move your head. They can happen when the vitreous gel in your eye pulls or

A rubber (aspirating) bulb can be used to remove mucus from a baby's nose or mouth when a cold or allergies make it hard for the

This vaccine is a live but weakened form of the chickenpox (varicella) virus. Children get the chickenpox vaccine as part of their

Herpangina is a viral infection that causes sore throat and pus-filled sores on the throat, tongue, tonsils, and roof of the mouth

A retropharyngeal abscess occurs when a throat infection forms a collection of pus (abscess) in the back of the throat. A

A filling is a substance that dentists use to replace a decayed or broken portion of a tooth. Commonly used substances for

A crown is a dental appliance that replaces and covers the entire part of a tooth above the gum line. A crown may be made of gold

Dentin is the middle layer of a tooth. It is made of hard minerals and protects the pulp (the inner core of the tooth) from

Enamel is the hard outer layer of a tooth made mostly of minerals. Enamel has tiny pores that can be seen only with a microscope