I have used this brand's products for a decade. My first device was the Classic/Flex, which worked perfectly. However, after developing a crack a few months ago, I sought a replacement. I ordered the Avant model from my dentist, but I have struggled with it, particularly with the difficulty of opening my mouth to breathe. Consequently, I have returned to using my old cracked device. The cost of replacing it again is prohibitive. It's unfortunate that this situation cannot be improved.
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