The present invention is an improved mouthguard which has incorporated into it at least one and preferably a multiplicity of breathing holes which extend through an exterior sidewall, an interior sidewall and/or through a bottom transverse wall in the body of the mouthguard. The mouthguard can also have incorporated into it at least one and preferably a multiplicity of breathing cavities extending from an upper surface of an exterior and/or interior sidewall into a portion of the sidewall to form one or more air passages.
