Phossy jaw is caused by

A. White phosphorus
B. Red phosphorus
C. Arsenic
D. Antimony.

Answer: A. White phosphorus.


Explanation:

                                                   

• Phossy jaw is a condition in which osteomyelitis and necrosis of the jaw, with multiple sinuses discharging foul-smelling pus.
• It is commonly seen frequent inhalation of white phosphorus fumes (red phosphorus is non-toxic) over a period of years in the region of a decayed tooth.
• Symptoms include toothache, which is followed by swelling of the jaw, loosening of the tooth, necrosis of gums and sequestration of bone in the mandible.