Hi, I recently have been getting jaw pains, and my dentist said i have TMJ and need to get a night guard to relieve my teeth grinding and clenching. However, they want to charge me $450 for it. I've been looking online at sites such as http://www.nightguardlab.com/ and similar sites that sell night guards for around $150 to $170. Do you think these online ones are legit or should i shell out the extra $300 for the one my dentist will give me?