Hi Christine, ZQuiet's design makes it one of the only anti-snoring mouthpieces that fits over retainers. However, we always recommend you check with your orthodontist fi... rst if you are receiving treatment.

Hi Sue, ZQuiet sells a firm mouthpiece that is made of the same material, but in a firmer texture that stands up to clenching and grinding. We sell it in both sizes. Peop... le usually start by ordering a comfort system with both sizes to determine which size works best, and if you wear through it quickly due ot clenching or grinding (under 3-4 months) we recommend ordering the size that works best for you in Firm.

Hi Dave, Sore teeth or the sensation of teeth shifting is a normal listed side effect when wearing ZQuiet, and if it resolves during the day it is likely not a problem. O... n rare occasions, using a device like ZQuiet can expose underlying tooth or gum issues that should be discussed with your dentist. It sounds like you should discontinue use and check with your dentist. We're happy to provide a refund if you would like. Simply email help@zquiet.com and we will get that taken care of.

Hi Beth, You can order single sizes on our website. Visit the store, click on "Shop All" and you will see ZQuiet Single Packs where you can select the size you want. Note... that single packs don't come with a case - only starter packs do. We recommend buying a case to protect your ZQuiet and because storing it in the case restores the hinge strength to increase it's useful life.

Hi Amy, Moving the lower jaw forward all night can sometimes cause your bite to feel off for a period of time in the morning. It always adjusts back into place. Our instr... uctions say that if your bite is off for more than an hour or two, it's best to stop use. Our FAQ section has a lot of great information, and so does this page with some videos. https://zquiet.com/pages/success Hope this helps!

Hello Mary, The sensation of tooth movement is common when using any oral appliance that moves the lower jaw forward. In some cases where the ligaments that hold the teet... h are loose or there is undetected gum disease, actual tooth movement can occur. If you have healthy teeth and gums, ZQuiet should be fine but we always recommend that you check with your dentist if you are concerned. Hope this helps!