Mastic Gum: A Hidden Gem for Dental Professionals The Pistacia lentiscus produces a resin from the tree called Chios mastic gum (CMG). The plant can be planted or replanted in other locations around the world, but it doesn’t produce the resin. Although mastic trees grow all over the Mediterranean, the special variety that grows in Chios is the only one that produces natural resin or mastic. Forget sugary treats; dental professionals seeking a natural ally for oral health could turn to an ancient