This isn't the exact model that I use, but it is almost identical and the same brand. I have been using the same two pairs for four years, and wouldn't be surprised to get another four out o them. I grind my teeth, and have since my wisdom teeth started growing in six years ago, and these things were exactly what I need when I couldn't afford to get my wisdom teeth pulled. Even at the time, I thought $30 was more than I wanted to pay, but I really didn't have much choice. I can now, safely say, that these are worth every penny. Just keep in mind that they have to be kept clean. The adjustable part is where it get tricky but if you pull it all the way out, you can get in there to rinse. I also let mine soak in mouth wash. Try not use if you haven't already brushed your teeth, as food particles get into the adjustment parts and are sometimes hard to clean out. Happy Grinding!
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