Chronic thumbsucking can cause large open bites and posterior crossbites (the constriction of the upper back teeth.)  The effect of thumbsucking depends upon the child’s age and the duration, consistency and force of the thumbsucking.  Fortunately, if we can identify the thumbsucking child before the maxilla (upper arch) is completely formed, usually around ages eight to nine, many of the occlusal problems created from thumbsucking can self-correct.  If these children go undetected, the dental malocclusion caused by thumbsucking can require complex orthodontic treatment.

The American Association of Orthodontics recommentds that all children be seen by an orthodontist by the age of seven, while thumbsuckers may be referred as early as age six.  Their is a very successful habit training technique that is approximately 90% effective, without the use of any orthodontic appliance.  With the few patients that we cannot motivate to stop thumbsucking, a fixed appliance such as a thumb crib may be indicated.

• The posterior occlusion is established when the first molars erupt. At that time, one can evaluate the antero-posterior and transverse relationships of the occlusion, as well as discover any functional shifts or crossbites.
• Incisors have begun to erupt and problems can be detected such as crowding, habits, deep bites, open bites and some jaw discrepancies.
• For some, a timely evaluation will lead to sigificant treatment benefits; for others, the principal immediate benefit is a parent’s peace of mind.
• The American Association of Orthodontists does not advocate comprehensive orthodontic treatment at age 7. However, interceptive treatment may be appropriate in many kinds of problems.