Patent ID: 7234933

Claim:
A dental appliance which is placed in a mouth of a user wherein the user has upper teeth and lower teeth, the dental appliance comprising: a generally U-shaped base having a length defined between a first end and a second end wherein the base has an upper occlusal surface and a lower occlusal surface which are sized to receive the upper teeth or the lower teeth of the user wherein the upper occlusal surface contacts the upper teeth of the user when the base is placed within the mouth wherein the lower occlusal surface contacts the lower teeth of the user when the base is placed within the mouth of the user wherein the base has an interior surface which substantially surrounds a surface of at least one of the upper teeth and at least one of the lower teeth wherein the first end has a rear portion which is made from a first material and the second end has a front portion which is made from a second material wherein the first material is stiffer than the second material wherein the second material moves at least one of the upper teeth of the user or at least one of the lower teeth of the user when the base is worn in the mouth of the user.