I started with an R1 and it was ok. I thought the squishy material would be comfortable as I am not used to sleeping with a nightguard (I have in the past but not regularly). It was comfortable and I built up my tolerance to wearing all night but would take breaks with it since it was a bit irritating to my gums. I already have receding gums so I was worried it would make it worse. I did wake up with some bleeding one morning and couldn’t wear the R1 for several days afterward. I bought the R3 because it looked like it was cut lower on the gum line and because my dentist said he recommends hard material for nightguard as opposed to squishy material because there is a tendency to bite and wiggle them while sleeping. I’m SO glad I bought the R3!! Within a week I was able to sleep comfortably with it all night and every night since. I’ve never had gum irritation with it and I haven’t had much for an adjustment period. It’s comfortable and I’m hopeful it can strengthen my jaw. At the very least, it’s helpful for me to quit grinding and gritting my teeth at night. Now to see if it will fix my crowded teeth! It has been a good investment, in my opinion!
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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.