For the first time ever, the American Dental Association is putting its seal on some Wrigley’s chewing gum products—they’ll now say that the ADA considers them products that are “clinically proven to help prevent cavities, reduce plaque acid and strengthen teeth.” The ADA and some health professionals say that this is a perfectly acceptable application of the seal, because a full study was carried out that proved the products work. The only problem is, the study was privately funded and the gum companies partially paid for them.