Crossbite in Children and Adults: Why It Matters and How to Fix It

What Exactly Is a Crossbite?

Normally, your upper teeth slightly overlap your lower teeth when you bite down. A crossbite is the opposite: one or more upper teeth bite inside (behind) the lower teeth.

Anterior crossbite: Front teeth affected Posterior crossbite: Back teeth affected Unilateral: One side of mouth Bilateral: Both sides

Why Crossbite Isn't Just a Cosmetic Problem

Crossbite causes real functional problems and long-term dental damage if untreated:

Children especially: Crossbite prevents normal jaw growth. Leaving it untreated during childhood allows the jaw to develop abnormally, creating permanent skeletal problems.

Anterior Crossbite (Front Teeth)

Presentation: One or more upper front teeth bite inside the lower front teeth. You might see the lower tooth in front of the upper tooth.

Causes: - Skeletal (jaw position mismatch) - Dental (individual tooth tipped wrong direction) - Habit (tongue thrust pushing upper tooth behind lower)

Treatment:

In children (ages 7–12): - Early intervention is critical - Fixed braces or removable appliances can correct the bite - Duration: 6–12 months for simple cases - Cost: $2,000–$4,000 - Success rate: Excellent when caught early

In adolescents (ages 13–18): - Braces are typical treatment - Duration: 18–24 months - Cost: $3,000–$7,000 - Success rate: Very good, but jaw growth must be considered

In adults: - Skeletal cases might need surgery - Dental cases respond well to braces - Duration: 18–28 months - Cost: $3,000–$8,000 (surgery adds $15,000–$30,000)

Posterior Crossbite (Back Teeth)

Presentation: Upper back teeth sit inside the lower back teeth on one or both sides.

Why it's serious: Posterior crossbite is often bilateral (both sides) and causes the most asymmetrical jaw growth and TMJ problems.

Treatment depends on age:

In children (ages 6–10): - Rapid palatal expander (RPE) is often used - Widens upper jaw to correct crossbite - Duration: 4–6 weeks active, then 6 months retention - Cost: $1,500–$3,000 - Success rate: Excellent; jaw is still malleable

In children (ages 11–13): - RPE may still work, but less efficiently - Braces might be needed - Duration: Variable - Cost: $3,000–$6,000

In adolescents/adults: - Braces alone might work for mild cases - Skeletal cases need surgery - Duration: 18–28 months (braces) or 24–36 months (surgery + braces) - Cost: $3,000–$8,000 (braces) or $20,000–$35,000 (surgery)

Why Early Treatment Matters for Crossbite

Crossbite in childhood is NOT cosmetic—it's a red flag for abnormal jaw development.

Age 7–9: Jaw is very moldable. Appliances like palatal expanders work amazingly well. Treatment is fast, inexpensive, and effective.

Age 10–13: Jaw is still moldable but less so. Appliances might work, but braces may be needed. Treatment is still very effective.

Age 14+: Jaw growth is mostly complete. Skeletal crossbites now require surgery. Dental crossbites still respond to braces, but correction is slower and more difficult.

Adulthood: Only braces or surgery can fix. Surgery is often needed for skeletal issues. More expensive, longer treatment.

Crossbite Correction Methods

Removable appliances (for children) - Spring-activated devices that correct individual teeth - Nighttime wear - Duration: 6–12 months - Cost: $1,500–$2,500 - Best for: Anterior crossbite in young children - Limitation: Requires compliance; only works for mild cases

Palatal expansion (rapid palatal expander) - Widens upper jaw to correct posterior crossbite - Manual screw-turning by parent - Duration: 4–6 weeks active phase - Cost: $1,500–$3,000 - Best for: Children ages 6–12 with posterior crossbite - Limitation: Doesn't work well after age 14 (palate fuses)

Traditional braces - Fixed appliances controlling tooth position - Works for both anterior and posterior - Duration: 18–28 months - Cost: $3,000–$7,000 - Best for: Adolescents and adults, complex cases - Limitation: Slower than expanders for posterior crossbite

Lingual braces - Hidden braces behind teeth - Can address crossbite, especially anterior - Duration: 18–28 months - Cost: $6,000–$10,000 - Best for: Adults concerned about appearance - Limitation: High cost, difficult to clean

Jaw surgery (orthognathic surgery) - Surgical repositioning of jaw - Necessary for skeletal crossbites that braces can't fix - Combined with braces (before and after surgery) - Duration: 2–3 years total - Cost: $20,000–$35,000 (often partially covered as medical necessity) - Best for: Severe skeletal crossbites, adults - Limitation: Surgery, recovery time, cost

Untreated Crossbite: Long-Term Consequences

5-year outcome of untreated crossbite: - Asymmetric jaw growth (face looks lopsided) - Uneven tooth wear - Gum recession on affected teeth - Possible TMJ clicking or discomfort

10-year outcome: - Significant facial asymmetry - Advanced gum recession - Bone loss around affected teeth - TMJ pain, limitation in jaw opening - Possibility of tooth loss in severe cases

20+ year outcome: - Permanent facial asymmetry - Teeth may be lost due to gum disease - Chronic TMJ dysfunction - Difficulty chewing, jaw pain - Complex, expensive surgical correction potentially needed

Decision Tree: What Treatment for Your Crossbite?

1. How old are you/your child?
2. Ages 6–10: Palatal expander or removable appliance (fastest, cheapest fix)
3. Ages 11–15: Palatal expander or braces (still very treatable)

4. Ages 16+: Braces for dental crossbite; surgery + braces for skeletal

5. How many teeth are affected?

6. 1–2 teeth: Braces or fixed appliance

7. 3+ teeth/bilateral: Might indicate skeletal issue; ask about jaw structure

8. Is it anterior or posterior?

9. Anterior (front): Removable appliances in kids; braces in older

10. Posterior (back): Palatal expander in kids; braces or surgery in older

11. Is it dental or skeletal?

12. Dental (teeth tipped wrong): Braces or appliances
13. Skeletal (jaw positioned wrong): Braces (if mild) or surgery (if severe)

Ask your orthodontist: "Is this dental or skeletal crossbite? What's your recommended treatment for my specific case?"

Key Takeaway

Crossbite isn't just a cosmetic issue—it causes uneven jaw growth, TMJ problems, gum disease, and tooth wear if untreated. Early intervention (especially with palatal expansion in children ages 6–12) prevents permanent facial asymmetry and is far cheaper than adult surgical correction.

If you notice crossbite in your child, don't wait for their permanent teeth to all erupt. Early evaluation at age 7–8 can catch problems when treatment is simplest, fastest, and cheapest. Untreated crossbite is one of the most regretted dental delays.

For adults, crossbite correction is absolutely worth pursuing—the long-term consequences of untreated crossbite (TMJ pain, gum recession, bone loss) are serious.