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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Opening of the new airport terminal in December 1991. Darwin International Airport (IATA: DRW, ICAO: YPDN) is the busiest airport serving the Northern Territory and the tenth busiest airport in Australia. It is the only airport serving Darwin. The airport is located in Darwin, Northern Territory's northern suburbs, 8 km (5.0 mi) from the Darwin city centre, in the suburb of Marrara.