Behind the betel nut smile: the quiet epidemic of oral cancer in Papua New Guinea

Papua New Guinea has the highest rate of oral cancer of any country tracked by the World Health Organization, and researchers at the University of Papua New Guinea link it to betel quid, a chewed mixture of areca nut, mustard stick and lime that's deeply woven into local custom as a greeting and social ritual. The Conversation reports the nut's active compound, arecoline, produces a dopamine hit that makes the habit pleasurable and addictive, but is also classified as probably carcinogenic. The country still has no national cancer registry, so the true scale is unknown, and researchers say many patients arrive for treatment only once the disease is already advanced. To close that gap, dentists from a dozen provinces have now been trained to spot early warning signs in the mouth's lining, with the hope that wider screening across PNG's hospitals can catch the disease sooner.

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