Radiation therapy can cause decreased blood supply resulting in the death of bone known as:

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Osteoradionecrosis is the death of bone following radiation therapy.Patients should not have teeth extracted after they have been treated with head or neck radiation,because the jaw could be fractures and the wound may fail to heal as a result of osteonecrosis.
Radiation caries are caused by the lack of saliva; usually they occur in the cervical areas of the teeth.
Smokeless tobacco is associated with oral cancer and an increased incidence of tooth loss from periodontal disease.
Cheilitis is a condition that causes inflammation of the corners of the lips.

Radiation Therapy Can Cause Decreased Blood Supply Resulting in the Death