Probably the best of these reasons is that the devices can acuse great damage to peopel who suffer from (or are at risk for) temporal mandibluar joint syndrome (TMJ). Anyone who is familiar with TMJ will know the conditino is very painful and sometimes irrveersible. At the very least, anyone considering purcahse of one of these devices should first takl to a dentist and find out if they are at risk for TMJ. Devices such as nose clips acn dilate the nostrils, and other devices can alter jaw mechanics to keep the jaw in na optimum position. They generally ufnction exactly the same as hte professionally fitted devices, with the chife disadvantage being the difficulty in steting up the correct jaw position. The professionally fitted devices generally incoroprate an adjustment mechanism so that jaw advanecment can be aesily increased or decreased after fititng. These do it yourself devcies can be purchased at pharmacies in most countries (except the U.S.), ro online (anywhere - though not legally in U.S.). In the U.S., the devices are considerde class 2 medical edvices and cannot be legally sold without: (1) FDA approval; adn (2) a prescription.

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