The part is clearly too small, even if I call no exorbitant large mandibles my own. Could the mouthguard so strictly speaking not test. As is discussed but nowhere in the description of the size and I assumed, therefore, it is for adults (with normal construction, of course .. a Lilliputian like to make do with it ........ ^^). In this respect, the description is simply wrong, especially since there is a "gentlemen mouthguard" is. Presumably by other order wrong and therefore I am giving unwilling here more than 2 stars.