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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For the Air National Guard use of this facility, see Truax Field Air National Guard Base. Dane County Regional Airport (DCRA) (IATA: MSN, ICAO: KMSN, FAA LID: MSN) (Truax Field) is a civil-military airport located six miles northeast of downtown Madison, the capital of Wisconsin.