Palatal expander: what parents usually ask
A palatal expander is an orthodontic appliance that widens the upper jaw to create space for teeth. Learn what to expect, how to care for it, and when to contact your orthodontist.
Medically reviewed by Dr. Jose, DDS — September 1, 2026
What Is a Palatal Expander?
A palatal expander is a custom-made appliance that your child’s orthodontist uses to gently widen the upper jaw. It’s typically made of metal and plastic, and it attaches to the back molars. The goal is to create more space for adult teeth to come in straight, or to correct a narrow upper jaw that may affect breathing or bite alignment.
Your orthodontist will fit the device to your child’s mouth and show you exactly how to care for it.
How to Keep the Expander Clean
Good oral hygiene is essential when your child has a palatal expander. Here’s what to do:
Brushing: Have your child brush around the appliance twice daily, using a soft-bristled toothbrush. Brush the outer surfaces of the device as well as the teeth and gums. Be gentle but thorough—food and plaque can collect in small spaces around the metal and plastic.
Flossing: Flossing becomes trickier with an expander, but it’s still important. Ask your orthodontist or hygienist to show your child how to floss carefully around the device, or ask about alternative cleaning tools your orthodontist recommends.
Rinsing: After meals and snacks, your child should rinse with water to wash away loose food particles. This helps prevent cavities and keeps the mouth fresher.
Adjustments: Your orthodontist may give you specific instructions for gently adjusting the expander at home (if applicable to your child’s type of device). Follow these instructions carefully. Never try to adjust it on your own without clear guidance.
What to Eat and What to Avoid
Your child can eat most foods, but you’ll want to steer clear of items that could damage the device or get stuck:
- Avoid: very sticky candies, chewy foods like caramel or taffy, hard foods like nuts or hard candy, and popcorn kernels.
- Okay: soft fruits, cooked vegetables, soft bread, pasta, yogurt, smoothies, and mild cheeses.
If something does get stuck or the device feels loose, contact your orthodontist right away rather than trying to fix it yourself.
When to Call Your Orthodontist
Most discomfort is normal and temporary. However, reach out to your orthodontist if:
- The device becomes loose or moves unexpectedly.
- Your child develops sores in the mouth that worsen or don’t improve after a few days.
- Your child has difficulty eating or speaking that lasts more than a week.
- There are visible cracks or damage to the appliance.
- Your child experiences severe pain that doesn’t settle after a day.
Your orthodontist is your best resource if anything feels off. It’s always better to check in early than to wait and see if a problem resolves on its own.
Next Steps in Your Child’s Orthodontic Journey
A palatal expander is often one step in a longer orthodontic plan. Your child may move on to braces or other appliances after the expansion phase is complete. For more information about the full timeline of orthodontic care for children, see our guide on child braces: signs and timing.
How MediMouth Helps
If your child needs a palatal expander or you want a second opinion on your orthodontist’s recommendation, MediMouth’s Arizona dental network includes orthodontists who can review your child’s case and answer your questions. Use our find-care tool to connect with a licensed orthodontist near you.
Frequently asked questions
Will my child be in pain with a palatal expander?
Your child may feel pressure or mild discomfort as the device widens the jaw, especially after adjustment. This is normal and usually settles within a day or two. If your child is in significant pain, contact your orthodontist to make sure the appliance fits correctly.
How long does my child need to wear a palatal expander?
The timeline depends on how much jaw widening is needed. Your orthodontist will create a treatment plan and explain the expected duration at your first visit. After the expansion phase is complete, your child may need to wear a retainer to hold the new position.
Can my child play sports or eat normally with an expander?
Most children can play sports and eat soft or normal foods. Avoid very sticky, hard, or crunchy foods that might loosen the device. Talk to your orthodontist about any specific activity restrictions, especially contact sports.