Schamschula R G, Adkins B L, Barmes D E, Charlton G
Community Dent Oral Epidemiol. 1977 Nov;5(6):284-6. doi: 10.1111/j.1600-0528.1977.tb01015.x.
The prevalence of dental caries and variables relating to the betel-chewing habit were examined in a sample of 301 rural New Guineans aged 12--24 years. Consistent inverse associations were demonstrated between caries experience and the intensity of betel chewing for individuals and aggregates of subjects. The results indicate that betel chewing confers a degree of protection against caries.