Though wearing a Herbst appliance does not cause pain, it can initially lead to some soreness in the jaw as the upper and lower jaws get used to wearing the functional appliance. If your child is experiencing any discomfort, taking OTC pain relievers should be all they need to feel better.
The appliance may rub against the insides of the cheeks, causing some irritation when the appliance is first installed. The body is smart, however, and the rubbed spots will quickly toughen up just enough to tolerate wearing the appliance without pain. Rinsing the mouth with saltwater can help with the irritation until the cheeks become accustomed to wearing the appliance.
Patients who are side sleepers may find that the appliance presses into the inside of their cheeks at night, causing discomfort. In this case, we recommend back sleeping if possible. If back sleeping doesn’t come naturally, try experimenting with different pillow combinations both under the head and around the body to support the back-sleeping position through the night.