A jaw exercise device includes a generally arcuate central elastomer plate with generally planar surfaces in opposed relationship. The planar surfaces have a plurality of protuberances depending therefrom; each protuberance being generally cylindrical in shape with each having an axis oriented to be perpendicular to the generally planar surface from which it depends. Each protuberance has protuberance walls, the walls having a protuberance height between a protuberance crown and a protuberance base. Two arcuate U-shaped channels are configured each to receive teeth of one of an upper or lower jaw of the user, within the channel. Each U-shaped channel defines a plurality of receptacles. Each receptacle located in a manner to receive, when urged into mating engagement with the central elastomer plate, a corresponding one of the protuberances.