An intraoral orthosis comprising a first shell (10) and a second shell (20), said shells (10, 20) being connected to one another by an adjustable connection device, said adjustable connection device comprising two detent lugs (31) which are respectively disposed on each lateral side of one of said shells (10, 20), each detent lug (31) adjustably cooperating with a respective adjustment housing (32), arranged on each side of the other of said shells (20, 10), each detent lug (31) comprising adjusting teeth (312) to adjust the position of the shells (10, 20) in relation to one another, and locking housings (311) to lock said position, said locking housings (311) being transversely oriented in relation to said adjusting teeth (312).
