Gum Any gum chewing can strengthen the jaw and stimulate stem cell growth, but harder textured varieties offer a more vigorous workout. Falim, a Turkish brand, is as tough as shoe leather and each piece lasts for about an hour. I’ve found the Sugarless Mint to be the most palatable. (Other flavors, such as Carbonate, Mint Grass, and sugar-filled varieties, tend to be softer and grosser.) Mastic gum, which comes from the resin of the evergreen shrub Pistacia lentiscus, has been cultivated in the Greek islands for thousands of years. Several brands are available through online retailers. The
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