Low-profile mouth guard

A mouth guard, comprising:

• an outer shell formed of a non-moldable material, the outer shell including a first surface and a second surface opposite the first surface;
• an intermediate layer formed of a first moldable material, wherein the intermediate layer is over-molded to the second surface of the outer shell;
• and
• an inner layer formed of a second moldable material, wherein the inner layer is over-molded onto at least one of the intermediate layer and outer shell, and wherein the inner layer is transitionable from a first state to a second state, the first state being a substantially flat unmolded state and the second state being a molded state.