How Common Are Sucking Habits?
Thumb sucking and pacifier use are completely normal parts of childhood development. Nearly all children between 3 and 4 years old engage in some form of sucking behavior, which helps them feel calm and secure. These habits naturally decline over time—by age 6 or 7, most children have stopped on their own. However, when these habits continue beyond age 3 or 4 years, they can start affecting how your child's teeth grow and develop.
The important thing to understand is that not all children who suck their thumbs or pacifiers will develop bite problems. Some children simply maintain these habits for short periods and stop naturally with minimal impact. Others continue longer and may develop more significant tooth and jaw changes. Your pediatric dentist can monitor your child's development and let you know if intervention might be helpful. The good news is that early action can prevent most problems from developing in the first place.
How Sucking Habits Affect Your Child's Teeth
When your child sucks their thumb or pacifier, they're creating pressure inside the mouth. This pressure is actually quite powerful—vigorous thumb sucking creates much stronger pressure than gentle pacifier use. When this pressure is repeated daily for months or years, it gradually shapes the bones and teeth in your child's mouth. Think of it like water wearing away a stone over time. The repeated pressure changes how the teeth and jaw bones grow.
Your child's upper front teeth are pushed forward and outward, while the upper jaw may become narrower. The lower jaw may shift position to compensate. These changes happen slowly over time, which is why a habit that starts at age 2 years might not show obvious problems until age 4 or 5 years. The longer the habit continues, the more significant the changes become. Fortunately, younger children's bones are still growing and changing, so they have a much better chance of natural correction once the habit stops.
Understanding Anterior Open Bite
One of the most common bite problems from sucking habits is something called an anterior open bite, which means there's a gap between your child's upper and lower front teeth when they bite down. This happens because the constant pressure from sucking pushes the front teeth apart and prevents them from meeting normally. About 80 percent of children with long-term, intensive sucking habits develop some degree of open bite.
The severity of the open bite depends on how long your child has been sucking and how intensely they suck. A child who sucks for just a few months might have barely noticeable changes. A child who sucks intensely for 2 years might have a gap of 2 to 4mm between their teeth.
The good news is that once your child stops sucking, many of these gaps close naturally. Research shows that 60 to 70 percent of open bites caused by sucking habits spontaneously improve once the habit stops, even without any special treatment. The younger your child is when they stop, the better the chance for natural correction.
How Sucking Habits Narrow the Upper Jaw
Beyond affecting the front teeth, sucking habits can also make your child's upper jaw narrower. This happens because the sucking motion creates pressure that pushes the sides of the upper jaw inward. Additionally, the roof of the mouth may gradually become higher and more arched. This narrowing can make it harder for all the permanent teeth to fit properly when they come in, potentially requiring braces or other treatment later.
About one-third to one-half of children with persistent sucking habits develop some degree of crossbite—a condition where the upper and lower back teeth don't line up properly side-to-side. Some of these crossbites are just functional (your child's jaw shifts to make teeth meet) and can improve once the habit stops. Others involve actual bone structure changes that may need more treatment. The width problems are more likely to persist even after the habit stops, compared to the front tooth problems which usually improve naturally.
Timing Matters: When Your Child Stops Sucking
The age at which your child stops sucking their thumb or using a pacifier is one of the most important factors in determining whether bite problems will develop. Here's what research shows: if your child stops by age 3 years, they have an 85 to 90 percent chance of avoiding significant bite problems. If they stop between ages 4 and 6 years, about 60 to 70 percent will avoid problems. But if the habit continues beyond age 6 years, only 35 to 45 percent will naturally correct without needing orthodontic treatment.
This is because your child's jaw bones stop being as flexible after age 6 or 7 years. Once the bones have settled into a certain shape, they're much less likely to change back naturally. This is why dentists recommend focusing on stopping sucking habits between ages 3 and 4 years—you're working within the window where natural correction is most likely. Waiting until later makes the problem harder to fix. The earlier you can help your child stop, the better the outcome will be.
Helping Your Child Break the Habit
Breaking a sucking habit works best when it's done positively and gently, not with punishment or shame. Your pediatric dentist can help explain to your child why it's important to stop, which often helps children who are old enough to understand. Many children respond well to reward systems—sticker charts or small rewards for sucking-free days encourage the behavior you want to see.
Some children do better with gradual reduction rather than stopping suddenly. You might help your child use a pacifier only at bedtime, then slowly shorten the time they use it. Others do better with something to keep their hands or mouth busy—a small toy or activity during times when they usually suck their thumb.
Positive praise and encouragement work much better than criticism. Your child isn't being bad by sucking their thumb—it's a normal childhood behavior that just needs to be outgrown. With patience and support, most children can successfully stop the habit.
When You Need Special Help: Palatal Cribs
If your child is age 4 or 5 years and still has an active sucking habit despite your best efforts to help them stop, your dentist might recommend a palatal crib. This is a small wire device that your dentist places on the roof of the mouth. It doesn't hurt or restrict normal eating or speaking, but it does provide feedback when your child tries to suck. When your child puts their thumb in their mouth, they feel the crib instead of the familiar sensation they're used to. Most children stop trying to suck within a week or two because the experience isn't rewarding anymore.
Palatal cribs work in about 75 to 85 percent of cases and remain in place for 6 to 12 months to make sure the habit is truly broken. They're particularly helpful for children who've resisted behavioral approaches or who have developed significant bite problems that need correction sooner rather than later. Your dentist can discuss whether a crib might be helpful for your specific situation. These devices are safe, don't harm the teeth, and often solve the problem much more quickly than waiting for the habit to stop on its own.
Tongue Thrust and Habit Perpetuation
Sometimes a child develops another habit called tongue thrust, where they push their tongue forward when swallowing. This can happen in children who've had sucking habits, because the gap created by sucking gives their tongue room to move forward. Tongue thrust can perpetuate bite problems even after thumb sucking stops. About 40 to 50 percent of children with open bites from sucking also have tongue thrust. When both habits are present, treatment becomes more complex and takes longer.
If your dentist notices tongue thrust, they might recommend speech therapy or special exercises to help your child relearn proper swallowing patterns. Working with a speech-language pathologist, along with stopping the sucking habit, gives the best results for correcting both problems. When both issues are addressed together, about 85 to 90 percent of children achieve good bite correction. If only the sucking is addressed and tongue thrust continues, the correction may be incomplete.
What to Expect: Natural Self-Correction
After your child stops their sucking habit, don't expect all the bite changes to disappear immediately. It takes time for the bones and teeth to remodel. However, you should start seeing gradual improvement within a few months. Gaps between teeth may start to close, the jaw may widen slightly, and the teeth may start moving to better positions. The process is slow but steady.
The amount of improvement depends on several factors: your child's age when they stopped (younger is better), how long the habit lasted (shorter is better), and whether there are other issues like Tongue Thrust (simpler is better). Most of the improvement happens in the first year or two after the habit stops. If your child still has noticeable problems after age 8 or 9 years, they may need orthodontic treatment to finish the correction. Your dentist will monitor your child's progress and let you know if professional treatment becomes necessary.
Conclusion
Sucking habits are a normal part of childhood, but continuing them beyond age 3 or 4 years can affect how your child's teeth and jaw develop. The good news is that most bite problems caused by sucking improve naturally once your child stops the habit, especially if they stop early. By helping your child break the habit gently and positively between ages 3 and 4 years, you give them the best chance for healthy dental development without needing complicated treatment later.
> Key Takeaway: Work with your pediatric dentist to gently help your child stop sucking habits by age 3 to 4 years, because this is the window when the most natural correction occurs and when prevention of future Orthodontic Problems is most effective. Early intervention is far easier and less costly than correcting significant bite problems later.