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High Quality Content by WIKIPEDIA articles! Phossy jaw, formally phosphorus necrosis of the jaw is an occupational disease of those who work with white phosphorus, also known as yellow phosphorus, without proper safeguards. It was most commonly seen in workers in the match industry in the 19th and early 20th century. Modern occupational hygiene practices have eliminated the working conditions which caused this disease.Phossy jaw was caused by chronic exposure to the vapour of white phosphorus, the active ingredient of most matches from the 1840s to the 1910s. This exposure caused a deposition of phosphorus in the jaw bones.