This fixed appliance is different from other expanders in that it doesn’t require patient compliance & expands the upper jaw more slowly, thus creating a more gentle physiological response. This is an excellent appliance to expand narrow upper jaws & to treat mild-moderate crowding and or crossbites. The appliance must remain in your mouth for about 4-6 months.

Read more about Expanders at the American Association of Orthodontists.

Home Care

  • Take over the counter pain medication as needed for any discomfort.
  • Moderate sensitivity and pressure is normal during your first 1-2 weeks with the expander. If excess pain or swelling occurs, don’t hesitate to contact Dr. Yoon through this site, or call your primary office directly.
  • As usual, stay away from hard, sticky, sweet foods which may distort the appliance.
  • It is essential to keep the QH (quad helix) clean. This means that the QH should get the same attention your teeth get ( and then some!). A water-pik and frequent mouth swishing can be a great addition to regular brushing of your teeth and of your appliance.

Common Concerns

  • If you experience any of the below, Do Not Worry as these are common symptoms and will get better in a few days.
  • The most difficult thing about a QH is getting used to it. Your tongue may get irritated or feel swollen. You may even get a slight imprint of the appliance on your tongue. This is expected and will subside.
  • You may feel like you can’t swallow. With practice, you’ll get used to swallowing with the appliance without any discomfort.
  • Your teeth may feel some discomfort, especially on the outside of the back teeth. It may help to bite on a rolled up tissue or towel to alleviate the pressure.
  • Speech may be difficult, and you may have a lisp especially during your first few days with the appliance. Practice speaking out loud at home, and it will improve your articulation.


  • If your appliance comes loose on both sides, carefully remove it and place it in your case so that it can be re-cemented on your next visit- the appliance may have come loose due to excess manipulation with your tongue/fingers or from a hard/sticky/chewy food or object.
  • If your appliance comes loose on one side, please call the office for an emergency visit so that it can be removed or re-cemented according to the doctor’s instructions.
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