X-rays are a type of radiation called electromagnetic waves. X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white. This is because different tissues absorb different amounts of radiation. Calcium in bones absorbs x-rays the most, so bones look white. Fat and other soft tissues absorb less, and look gray. Air absorbs the least, so lungs look black.
The most familiar use of x-rays is checking for broken bones, but x-rays are also used in other ways. For example, chest x-rays can spot pneumonia. Mammograms use x-rays to look for breast cancer.
When you have an x-ray, you may wear a lead apron to protect certain parts of your body. The amount of radiation you get from an x-ray is small. For example, a chest x-ray gives out a radiation dose similar to the amount of radiation you're naturally exposed to from the environment over 10 days.
Dry mouth is the feeling that there is not enough saliva in your mouth. Everyone has a dry mouth once in a while - if they are nervous, upset or under stress. But if you have a dry mouth all or most of the time, it can be uncomfortable and can lead to serious health problems.
Symptoms of dry mouth include
A sticky, dry feeling in the mouth
Trouble chewing, swallowing, tasting, or speaking
A burning feeling in the mouth
A dry feeling in the throat
Cracked lips
A dry, rough tongue
Mouth sores
An infection in the mouth
Dry mouth is not a normal part of aging. Causes include some medicines, radiation therapy, chemotherapy, and nerve damage. Salivary gland diseases, Sjogren's syndrome, HIV/AIDS, and diabetes can also cause dry mouth.
Treatment depends on the cause. Things you can do include sipping water, avoiding drinks with caffeine, tobacco, and alcohol, and chewing sugarless gum or sucking on sugarless hard candy.
NIH: National Institute of Dental and Craniofacial Research
