I've been using reviv 2 for just a week and I can already see changes within this time. Based on the alignment of my upper teeth I can tell my palate is expanding already, and my rotated front teeth already feel like they are straightening out. The first few nights I had to wake up and take the retainer out because it was quite painful, but every day has become a bit easier, but this is how I know it is working. Kind of feels like how the first day of getting your braces tightened feels like, except it's morseo affecting the upper palate. Also the "tongue hammock" has been nice. This retainer really forces me to breathe through my nose, which is a habit I've been struggling to develop.
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Reviv is a company that sells mouthguards that utilize 'dental biomechanics'.
Meaning that it naturally stretches the soft tissue of the mouth and skull and expands the arches and straightens teeth over time.
Also the body and many other health conditions can correct over time as part of the process.