Conditions / Dental crowding & orthodontic relapse
Dental crowding & orthodontic relapse
When teeth crowd or shift after orthodontics, the cause often includes tongue and lip posture as much as anatomy. Therapy can reduce the risk of relapse.
Reviewed by Gina Sabbak, RDH · Myofunctional Therapist, Louisville KY. Last reviewed . Educational content — not a substitute for in-person evaluation.
What it is
Teeth want to be in equilibrium with the forces around them: tongue pressure on the inside, lip and cheek pressure on the outside. When the inside force is weak (low tongue posture, mouth breathing), teeth drift outward and crowd.
Orthodontic relapse is common after braces or aligners when the underlying muscle pattern isn't addressed.
Common signs
- Teeth that crowded before orthodontics
- Crowding returning after braces or aligners
- Mouth breathing or low tongue posture
- Difficulty retaining orthodontic results
How myofunctional therapy may help
Educational, not diagnostic. Outcomes vary; results are not guaranteed.
Establish tongue-up posture to provide consistent inward pressure.
Establish lip-seal and nasal breathing to balance the outward forces.
Coordinate with your orthodontist for retention planning.
What to expect
Pre-orthodontic: 2–3 months before treatment begins.
Post-orthodontic: 4–6 months concurrent with retention.
Keep learning
Related reading
- What is myofunctional therapy, really?
Educational article (~5 min read).
- Pre- and Post-Orthodontic Support
How this service supports this condition.
- All conditions we work with
The full set of myofunctional patterns we support.
- How we may help
Overview of the assessment and program structure.
Common questions about dental crowding & orthodontic relapse
- Why are my teeth crowded even though I had braces?
- Teeth want to be in equilibrium with the forces around them. Tongue pressure on the inside balances lip and cheek pressure on the outside. When the tongue rests low or you breathe through your mouth, that inward force is weaker, and teeth drift outward and crowd over time. This is one of the common reasons teeth can shift back after orthodontic treatment if the underlying muscle pattern is not addressed.
- Can myofunctional therapy prevent the need for braces?
- Sometimes — for younger children whose faces are still growing, establishing tongue-up posture, lip seal, and nasal breathing can support palate width and dental arch development in ways that reduce or simplify future orthodontic needs. For older teens and adults, therapy is generally used alongside orthodontics or to support retention, not in place of it. The right answer depends on age, growth stage, and the specific case.
- What is myofunctional therapy's role after orthodontics?
- After braces or aligners, the most common reason teeth move is that the underlying muscle and posture pattern has not changed. Myofunctional therapy focuses on tongue-up rest posture, lip seal, nasal breathing, and a mature swallow — the muscle patterns that keep teeth in place. We coordinate with your orthodontist on retention planning. See our Pre- and Post-Orthodontic Support (/services#pre-post-orthodontic) service for more.
Open references
Where the illustrations come from
The anatomical illustrations on this page are drawn from openly licensed educational sources. We attribute them in the caption; the canonical sources are linked here for anyone who wants to verify or use them.