Orthodontic info
My child sucks a thumb or uses a pacifier. When does that become an orthodontic problem?
The American Association of Orthodontists says in an FAQ answer dated December 2022 that a thumb, finger or pacifier habit that goes on beyond age 4 could have unwanted consequences, because prolonged sucking exerts force on the teeth and the bone that supports them.
On this page
The American Dental Association (ADA) frames the turning point around the permanent teeth, saying that after they come in, sucking may cause problems with the proper growth of the mouth and the alignment of the teeth.
What a lasting habit can change in the mouth
A sucking habit that lasts can move teeth and reshape bone. The American Association of Orthodontists (AAO) lists the possible results: "Teeth may be pushed forward, an open bite may develop, and bone may become misshapen." Its glossary describes an anterior open bite as one in which "the front teeth do not touch when the back teeth are closed together." The ADA adds that after the permanent teeth come in, sucking "can also cause changes in the roof of the mouth." An orthodontist checks for each of these at an exam.
How hard, how often and how long the child sucks
The way a child sucks is part of the answer. The ADA says the intensity of the sucking "is a factor that determines whether or not dental problems may result." Children who rest a thumb passively in the mouth, it says, are less likely to have difficulty than children who suck vigorously, and some aggressive thumbsuckers may develop problems with their baby teeth. The ADA's page on dental concerns in babies and kids puts it more broadly: "The frequency, duration and intensity of a habit will determine whether or not dental problems may result." Describe the habit plainly at the visit.
Signs a parent can watch for at home
Parents can watch the teeth, not only the habit. The AAO's list of reasons to talk with an orthodontist includes a thumb, finger or pacifier habit "that appears to be affecting the teeth or jaws." At home, that can look like upper front teeth pushed forward, or front teeth that stay apart when the back teeth close. The ADA notes that "Thumbsucking is a natural reflex for children." When a child sucks for comfort, the ADA's advice is to focus on correcting the cause of the anxiety and to provide comfort. Bring any change in the teeth to the check-up.
What the first exam looks for
At the first exam, the orthodontist looks at what the habit has done. The AAO says an examination would in general reveal an existing or developing orthodontic problem, or show that no problems are present at this time. That visit is laid out on the first consultation page of Carvalho & Roth Orthodontics, and the AAO's October 2026 article names "Thumb, finger, or pacifier habits that are affecting the teeth or jaw growth" among the concerns an orthodontist may recommend early treatment for. If the bite has changed, the practice's two-phase treatment post weighs how early care fits with later care. In an FAQ entry dated October 2026, the AAO recommends a first orthodontic check-up no later than age 7, and sooner if a concern appears.
Questions
Frequently asked questions
Is a pacifier habit easier to break than thumb sucking?
Yes, often. The ADA says pacifiers can affect the teeth essentially the same ways as sucking fingers and thumbs, but that a pacifier is often an easier habit to break.
Does sucking on lips or a blanket count too?
Yes. The AAO's answer, dated December 2022, names lips and fabric such as clothing or a blanket alongside thumbs, fingers and pacifiers, and it says sucking on any of them beyond age 4 could have unwanted consequences.
Should we talk to the dentist or the orthodontist about the habit?
Each has a part. The ADA's advice for a parent concerned about thumbsucking is to consult the dentist, and it says the dentist or pediatrician may prescribe a remedy such as a bitter medication to coat the thumb. Whether the habit has affected the teeth, bite or jaws is what an orthodontist evaluates, and the AAO says parents can contact an orthodontist directly without a referral.
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