Chronic snorting of cocaine and use of methamphetamines can cause abnormal changes in enamel. Swimmers who spend a lot of time in overchlorinated pools can lose tooth enamel, as can people who work with acids. Excess fluoride ingestion (fluorosis) during childhood can cause mottling of the enamel. Damaged tooth enamel can allow bacteria to more easily invade the tooth and form a cavity.
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McChord Field. McChord Field (IATA: TCM, ICAO: KTCM, FAA LID: TCM) is a United States Air Force base in the northwest United States, in Pierce County, Washington. South of Tacoma, McChord Field is the home of the 62d Airlift Wing, Air Mobility Command, the field's primary mission being worldwide strategic airlift. The McChord facility was consolidated with the U.S. Army's Fort Lewis on 1 February 2010 to become part of the Joint Base Lewis-McChord complex.