A phototherapeutic system for providing phototherapy inside a user's mouth comprises a housing; and a plurality of radiation sources disposed in the housing, wherein the plurality of radiation sources is configured to provide to the user's mouth a plurality of beams, wherein at least two beams of the plurality of beams have different wavelengths, and wherein a portion of the housing is configured to receive a pressure resulting from the user's mouth so as to prevent the housing from moving during the phototherapy.