The TheraSom Cast by Quali-Som is unique among oral appliances in that it comes with a 5-year warranty and avoids most temporomandibular joint disorder-related (TMJ) problems, according to creator Dr Thomas Meade. It does not use any tongue space on the lingual of the mandibular teeth and maintains the separation of the anterior teeth that the tongue automatically rests in all night, due to normal swallowing. This also eliminates the need for a repositioning device in the morning, the company says. It works by bringing the lower jaw gently forward, allowing more tongue space and thus increasing the opening of the airway at the back of the throat.