This invention relates to a mouth prop or mandible cushion. In modern therapy for the treatment of certain psychological conditions, electric shocks are given the patient. The-shocks cause an involuntary contraction of the muscles, resulting in a closing and clamping of the patients jaws with such force that damage is often done to the teeth and tongue. Cushioning devices have been used to prevent such tooth contacts. These devices occasionally result in suffocation of the patient, and often prevent proper administration of oxygen for resuscitation purposes. 

The principal object of this invention is to provide a mandible cushion which will efiiciently and effectively prevent injury to the teeth and tongue of a patient; which will provide a free open-air passage for breathing purposes; and which can be quickly and easily attached to a conventional oxygen mask for the administration of oxygen or other gases.