Turning a palate expander takes about 10 seconds once you get the hang of it. You insert a small key into the hole on the expansion screw, push it toward the back of the mouth until the screw clicks into its next position, then remove the key by pulling down and away. Most people find the first few turns nerve-wracking, but the motion quickly becomes routine.
Step-by-Step Turning Instructions
You’ll need the small metal key your orthodontist gave you and good lighting. A flashlight or phone light helps enormously. Have the person wearing the expander tilt their head back, or if you’re turning your own, stand in front of a well-lit mirror with your mouth open wide.
First, locate the hole in the center of the expansion screw. It sits in the middle of the palate, and the hole faces toward the front of the mouth before each turn. Insert the key into the hole until it is firmly seated. You should feel it click or lock into place.
Next, push the key straight toward the back of the mouth. You’ll feel resistance and then a small click as the screw rotates. Keep pushing until the key meets the back of the expander and stops on its own. At this point, a new hole will appear at the front of the screw.
Now remove the key carefully. Push it back and down toward the tongue as you pull it out. This is the most important part: do not pull the key forward toward the front of the mouth, because this can reverse the turn you just completed. The new keyhole should be clearly visible once the key is out. If you can see it, the turn was successful.
How Often to Turn
Your orthodontist will give you a specific schedule, typically one or two turns per day. Each turn opens the screw by roughly a quarter of a millimeter, so the expansion happens gradually. The active turning phase usually lasts a few weeks, depending on how much widening is needed. After that, the expander stays in place for several months without any more turns, giving new bone time to fill in the gap.
Stick to the exact schedule you were given. Skipping turns can slow progress, and doing extra turns adds unnecessary pressure. If you miss a turn, don’t double up the next day without checking with your orthodontist first.
What Happens Inside Your Mouth
The roof of your mouth is made of two bones joined by a seam of softer tissue running front to back. Each turn of the screw pushes these two halves apart by a tiny amount. The body responds by growing new bone and cartilage to fill the widening gap. Research shows that cells along the edges of the seam ramp up their activity dramatically during expansion, with the rate of new cell growth increasing roughly three to five times compared to normal. Bone-remodeling cells also increase by 60 to 160 percent during the process. This is why the expander stays in your mouth long after you stop turning: the new bone needs months to harden and stabilize.
You may notice a gap forming between your two front teeth during the active phase. This is completely normal and actually a sign the expander is working. The gap typically closes on its own or is corrected with braces afterward.
Managing Discomfort After Turns
Some pressure or mild soreness after a turn is normal, especially during the first week. The feeling is similar to the tightness after a braces adjustment and usually fades within 15 to 30 minutes. Over-the-counter pain relievers like acetaminophen or ibuprofen can help if the pressure is bothersome.
A palate expander should not cause severe pain. If a turn produces sharp, intense pain or if discomfort lasts more than a few hours, stop turning and contact your orthodontist before continuing the schedule.
Keeping the Screw Clean
Food trapped around the expansion screw can make turning difficult and create hygiene problems. A few habits keep the mechanism clear:
- Rinse after every meal. Swishing water dislodges loose food before it hardens around the metal.
- Brush gently over the expander. Use a soft-bristle toothbrush to clean the metal bars and the teeth the bands attach to.
- Use an interdental brush. A small proxy brush fits between the wires and teeth to reach spots a regular toothbrush misses.
- Try a water flosser. A gentle stream of water aimed at different angles flushes debris from the crevices under and around the appliance.
- Inspect with a mirror. After cleaning, check for any remaining food. If you spot something, go back and clean that area again.
Sticky foods like caramel, chewy candy, and gum are the biggest culprits for jamming the screw area. Hard foods like popcorn kernels and whole nuts can also lodge in the appliance or bend wires. Cutting food into small pieces reduces the chance of anything getting stuck.
What to Do if the Screw Gets Stuck
If you insert the key and the screw won’t budge, the most common cause is food packed into the mechanism. Clean the area thoroughly with a proxy brush or water flosser and try again. Forcing the key can damage the appliance.
Sometimes the screw turns backward accidentally, which shifts the keyhole toward the back of the expander instead of the front. If this happens, insert the key into the hole facing the back of the mouth and push it in the direction of the arrow printed on the screw (toward the throat) until the next hole reappears at the front. This corrects the reversed turn and puts you back on track.
If the key still won’t turn after cleaning and checking the direction, or if the appliance feels loose or shifted, contact your orthodontist before attempting any more turns.
Tips for Easier Turns
Parents turning a child’s expander often find it easier to have the child lie on a bed or couch with their head tilted back and mouth wide open. This gives a clear line of sight to the screw. Using a flashlight held by a second person, or a headlamp, makes the tiny keyhole much easier to spot.
Turning at the same time each day helps you remember and keeps the expansion consistent. Many families build it into their bedtime routine so any mild soreness passes during sleep. If your schedule calls for two turns a day, spacing them out (morning and evening, for example) distributes the pressure more evenly than doing both turns back to back.