Abstract: A mouthguard, serving to protect the teeth, temporomandibular joint, head and neck, is user formed of silicone material by placing uncured silicone material in a tray, impressing the upper teeth into the material, removing the tray before complete curing of the material, impressing the biting or occlusal surfaces of the lower teeth into the material, and permitting the material to cure. The tray is flexible and may comprise two or more separate or separable pieces to facilitate removal.