An MRA (Mandubulair Repositioning Appliance) against snoring is a possible treatment for sleep apnea. The MRA against snoring is a kind of plastic sheet that is placed overnight. Around the teeth the position of the lower jaw slightly adjusted so that the trachea is opened further. In this way the MRA helps reduce snoring and sleep apnea.The MRA against snoring has been tested. It was found that in 97% of cases, the MRA has the desired effect. An MRA is not only to snoring but also against sleep apnea. In sleep apnea, the airway is completely closed temporarily during sleep. The MRA will prevent this.