Mouthguard having an extra-oral portion and an intra-oral portion

A mouthguard for a patient, comprising a single planar piece of compressible flexible material, said piece comprising an intra-oral portion and an extra-oral portion, said intra-oral portion comprising two intra-oral curved arms and the extra-oral portion comprising two extra-oral curved arms which extend in mirror image on either side of a line in the center of said extra-oral portion, said extra-oral arms being longer than said intra-oral arms, said extra-oral portion having a W-shaped outer edge with a central indentation between said extra-oral curved arms to allow flexibility of the mouthguard, wherein said extra-oral portion is generally curved around and parallel to said intra-oral portion, wherein each said intra-oral curved arm is of a size enabling said intra-oral curved arms to fit in the mouth of said patient, and each said intra-oral arm is separated from the extra-oral portion by a side indentation, wherein said intra-oral curved arms together form a U-shaped intra-oral portion having the side indentations along the outer edge of said U-shaped intra-oral portion, for placement of said intra-oral portion between said patient's upper and lower teeth, wherein when said mouthguard is placed in the mouth of the patient each side indentation receives a corner of the mouth and the extra-oral arms extend along the cheeks of the patient on each side of the patient's face.