The mouthpiece includes an arch-shaped guard having an inner surface. The inner surface is contoured to follow a shape of a dentition. The arch-shaped guard is sized to span at least a portion of upper teeth and a portion of lower teeth in the dentition. The mouthpiece includes a bite plate positioned along the inner surface and dividing the arch-shaped guard into an upper and lower portion. The mouthpiece includes a first light array arranged along the lower portion of the arch-shaped guard, and a second light array arranged along the upper portion of the arch-shaped guard. The first and second light arrays are arranged at offset distances from the bite plate where the offset distance of the second light array is greater than the offset distance of the first light array. The first and second light arrays are arranged to direct light onto the upper and lower teeth, respectively.
