A dental appliance may have a pair of treatment portions and a pair of retaining surfaces that hold the treatment portions within the patient's mouth. With the treatment portions properly positioned, when the patient's mouth is in the maximum inter-cuspation position: (1) the upper canine teeth contact the upper surfaces of the treatment portions； (2) the lower teeth contact the lower surfaces of the treatment portions； and (3) no upper tooth physically contacts a lower tooth. As a result, bruxism and/or other ailments can be effectively treated.
