Dental crowding & orthodontic relapse

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.

Can dental crowding be caused by myofunctional issues?

Yes — dental crowding is often a symptom of low tongue posture, mouth breathing, or an atypical swallow pattern. When the tongue does not rest on the roof of the mouth, the dental arch does not receive the gentle inward pressure that shapes its development. Over time, this leads to a narrow upper arch and crowded teeth. Myofunctional therapy addresses the muscle pattern that contributed to the crowding in the first place.

My orthodontist recommends expansion. Is myofunctional therapy still needed?

Yes — expansion widens the dental arch, but the muscle pattern (tongue posture, nasal breathing, swallow) must be retrained for the new arch width to hold. Without the muscle work, the arch tends to narrow again after the expander is removed. The most successful expansion outcomes combine orthodontic expansion with coordinated myofunctional therapy, before, during, and after the active expansion phase.

Is there a connection between crowded teeth and crowded airway?

Yes — a narrow upper dental arch often correlates with a narrow nasal passage and reduced airway volume. This is one reason children and adults with crowded teeth are also more likely to snore, mouth-breathe, or have sleep-disordered breathing. Expanding the arch and retraining the muscle pattern often helps both the dental crowding and the breathing — which is why orthodontists and ENTs increasingly refer to myofunctional therapy.