Thumb sucking in young children is a normal response to anxiety and stress. Still, this behavior should decrease by ages 2-4 and stop by age 5. Many children are slow to break the habit, which can lead to anxiety for parents. Is it worth the stress to break the thumb sucking habit? Yes, because long-term thumb sucking can cause chewing difficulties, speech abnormalities, and dental problems.
The longer and harder a child sucks his or her thumb the more harm is done to the teeth, palate, and jaws. Regular, strong thumb sucking makes front teeth move and can even reshape the jaw bone and palate. Upper front teeth flare out and tip upward while lower front teeth move back and inward. But, how can something as small as a child's thumb or finger actually move bone?
Children’s jaws are rich in blood supply and fairly low in mineral content like calcium. This makes the jaws of children under age 8 especially soft and flexible. As a result, prolonged thumb or finger sucking easily deforms the bone around the upper and lower front teeth. The deformity produces a hole or gap when teeth are brought together, known as an open bite.
If a child stops thumb sucking before the loss of baby front teeth and the arrival of adult front teeth, most or all of the deformity may disappear. However, if the habit persists, there may be lasting deformity.
Home remedies may be advised. Common methods include:
Thumb sucking is a deep-rooted behavior and may need more than these remedies offer. The child's desire to stop will determine the success of any method.
One answer to thumb sucking is a simple device called a crib. The crib is placed on the child's upper teeth by an orthodontist, dentist, or pediatric dentist. It usually stops the habit the first day of use.
The crib’s technical name is a "fixed palatal crib.” It is a type of brace that sits full-time on the upper teeth and roof of the mouth. The crib consists of a half circle of wires connected to supporting bands or rings. The half-circle of flared wires fit behind the child's upper front teeth. It is barely visible in normal view. The bands are fastened to the baby molars.
The first step for parents is to make an appointment for their child with an orthodontist or dentist.
What to Expect
At the first visit, the dentist will ask about the child’s thumb sucking habits and examine the child for problems with tooth position and bite. If the teeth and jaws show change from long-term thumb sucking, the dentist may recommend a crib to stop the habit.
A second appointment is then arranged. Dental records such as clay impressions, facial and dental photographs, and jaw x-rays are taken.
The dentist begins crib construction at the third visit. The crib is cemented at the fourth appointment.
The child will experience soreness of upper back teeth for a few hours. You may also notice altered speech for 1-2 days. Your child will need to avoid chewing gum, hard and sticky candy, popcorn, peanuts, and other brace-destroying foods. Thorough tooth brushing after each meal is stressed to prevent food and plaque build-up, gum infections, and cavities.
Parents should know that a child with a newly placed crib may have trouble sleeping at first. The device is not painful, but it takes away a comfort that may have helped the child fall asleep. Be sure to offer lots of tender loving care, words of support, and praise to provide a smooth transition.
After crib placement, the patient is checked in 2-4 weeks, and then seen every 1-2 months until the appliance is removed. These visits are short, and not painful. In cases where hard or sticky foods have loosened the bands, re-cementation may be needed. Avoiding the foods should stop this problem.
After the crib is cemented, there is nothing to adjust and no moving or removable parts. It is one of the simplest, yet most effective dental devices because it takes away the habit's pleasure. Crib wires prevent the thumb or finger from touching the gums behind the front teeth and on the roof of the mouth, turning a pleasant experience into an unpleasant one. With no satisfaction, the child has no incentive to continue.
As a rule, the front tooth position is better within two weeks after crib placement. It takes 4-6 months for an open bite to close and the front teeth to straighten. The brace is left on 9-12 months, plenty of time for the habit to fade away.
What is a good age to begin crib treatment? The ideal time is when upper front baby teeth become loose and before the adult teeth have pushed out. This usually occurs just before or after age 6. Ending the habit allows adult teeth to have better positioning.
Sucking on a thumb, finger, or blanket may be noted in preteens, teenagers, and even adults. The initial orthodontic treatment is the same for all, placement of a crib to break the habit. For teens and adults, counseling may be suggested to deal with any underlying psychological problems.
American Academy of Pediatric Dentistry
Mouth Healthy—American Dental Association
Canadian Dental Association
The College of Family Physicians of Canada
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Last reviewed January 2016 by Michael Woods, MD Last Updated: 3/11/2014