The oral interface used with iNAP is an essential component of the iNAP system. It is worn in the front of the mouth, and the larger flange fits between the front teeth and the lips, similar to how you would wear a snorkel. The smaller flap fits behind the lower teeth to help secure it in the mouth. The IO-7 was the original oral interface that was released in the US, and is praised for its comfort.
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