I noticed improvement literally day one over night. Muscle memory is instant. I got it for jaw alignment and to fix my slight overbite. Get a chiseled jawline. The only problem is I would leave it out and my puppy ate it every time. So they shipped me new one but But the little idiot ate that too and now I need to buy another one because it is that good.
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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.