Short answer: Thumb sucking and pacifier use are natural reflexes in infancy and decrease on their own in most children. If the habit continues until late in the baby-tooth period, that is, into the ages when the permanent front teeth erupt, forward tilting of the upper front teeth, gaps between the front teeth and narrowing of the palate may be seen. The extent of the effect varies with duration, daily frequency and the intensity of sucking, and is assessed by the dentist.
Why do these habits exist?
The sucking reflex begins in the womb. Babies find comfort in sucking even when they are not hungry; a thumb or pacifier gives a child a sense of security before sleep, when tired and when bored. For this reason the habit itself is not a “problem” but a normal part of development. What matters is how long the habit continues and how intensely.
Possible effects on tooth alignment and the jaws
A thumb or pacifier applies a repeated, light force to the teeth and palate; the cheeks and tongue also change the balance. With habits that continue for a long time, the following may be seen:
- Open bite: A vertical gap remaining between the front teeth when the mouth is closed. For details, see our page on open bite.
- Forward tilt of the upper front teeth: The upper incisors lean forward and the lower incisors may be left behind.
- Narrowing of the palate and crossbite: During sucking, the cheek muscles can squeeze the upper jaw from the outside, which can lead to a crossbite in the back teeth.
- Change in tongue position: The tongue can settle into the gap that stays open; this may be seen together with a tongue thrust habit.
Some of the changes that occur in the baby-tooth period may correct themselves over time after the habit is stopped. If the habit continues after the permanent teeth have erupted, orthodontic support may be needed in most cases.
At what age should you pay attention?
- Sucking habits up to the age of two or three are generally just observed.
- If it still continues intensely during the day after the age of four, it is sensible to consult a dentist.
- When the permanent front teeth begin to erupt (usually around the ages of six to seven), continuing the habit can increase the effect on the teeth.
- A similar approach applies to pacifiers; even pacifiers described as “orthodontic” can affect the teeth when used for a long time.
How does a child give up the habit?
The biggest factor that makes stopping harder is pressure. Scolding or shaming often shifts the habit to hidden hours. The following steps generally work better:
- Understand the reason: If the habit is a response to a feeling such as distress, sleeplessness or jealousy of a sibling, deal with that first.
- Reinforce positively: Mark the days without a thumb or pacifier on a chart and share them with a small, age-appropriate celebration.
- Keep the hands busy: Offer alternative ways to relax before bed, such as a book, a soft toy or a massage.
- Go gradually: Cutting back on the pacifier first during the day and then during sleep is less stressful for the child.
- Involve the child: Older children are more willing when they feel the decision is theirs.
If the habit continues despite these methods and its effect on the teeth is visible, the dentist may suggest a habit-breaking appliance according to the child's age and cooperation. These appliances should be explained to the child not as a punishment but as a supportive reminder. For the general approach in children, you can look at our pages on orthodontics for children and early orthodontic treatment.
What is assessed at the examination?
The dentist first asks about the type of habit, how often it occurs during the day and how long it has continued. They then look at the position of the front teeth, whether a gap remains at the front when the mouth is closed, the width of the palate and the bite of the back teeth. When needed, jaw development is also assessed with X-rays and measurements. The aim is not only to “make them stop the habit” but to interpret correctly the current state of the teeth and jaws.
Daily tips for parents
- Instead of pulling your child's thumb out of their mouth, offer an activity that keeps their hands occupied.
- Calm the sleep routine; rituals such as light, music and a story can help in the move to sleeping without a pacifier.
- When everyone at home takes the same approach, it prevents the child from becoming confused.
- It is normal to see a setback after the habit has been given up; you need to be patient and not increase the pressure.
- Dental check-ups help monitor the child's development, so do not skip regular visits.
How does a habit-breaking appliance work?
These appliances are mostly fixed to the upper teeth and make it harder for the thumb or tongue to settle involuntarily. They are chosen taking into account the child's age, cooperation and the changes already present in the teeth. Speaking and eating are things that are usually got used to again within a few days of fitting. The appliance is not a solution on its own but a support used together with the child's motivation; for this reason family support and regular check-ups shape the process.
Frequently asked questions
Do the teeth of every child who sucks their thumb become misaligned?
No. The effect depends on the duration of the habit, its daily frequency and the child's jaw structure. Short-term and mild habits are less likely to leave a lasting mark.
Is a pacifier better than a thumb?
Giving up a pacifier is often easier, because it can be taken away. However, both can affect the teeth in a similar way when used intensely and for a long time.
Do the teeth correct themselves after the habit is stopped?
If it is stopped during the baby-tooth period, some of the changes recede. If a lasting condition has developed in the permanent teeth, assessment and, if needed, orthodontic treatment may be required.
How can you find out what suits you?
The information here is general; the right plan for your child is determined through an examination and the dentist's assessment. At our clinic in Oran, Çankaya, Ankara, we discuss your questions with you during the first orthodontic examination.
