An adjustment period can be expected while your mouth gets used to your SleepTight Mouthpiece. This is actually the case with any mandibular advancement device (MAD), but not all anti snoring devices. Some expect to put one in and not even realize it's there. Then, they are disappointed when their jaw is a little sore. If you know what to expect then expectations can be a little more realistic.
It is important to remember that snoring mouth guards are not for children.
The first thing you will likely experience is drooling. It is very common to experience excessive salivation for the first few nights. This will typically improve quite quickly. When you place a foreign object in your mouth, your brain thinks it is food and sends the signal to produce saliva to help chew, swallow, and digest. After it learns that this device is not food, the signals won't be so persistent. Some people prefer to sleep with a towel under their head the first few nights, so their pillowcase doesn't get soaked.
Soreness can be expected, too. Your mouth needs to get used to it being in a different position all night. If you have worked a specific muscle that you were not used to using then you know how sore it feels. This is what happens when the muscles in your mouth are engaged overnight. That being said, although soreness is expected if you experience severe pain in your jaw or TMJ discontinue use and talk with your medical care provider.
Some advice on fitting SleepTight
If mouth guards for snoring do not work for you consider a Salt Therapy machine.