In other words, I assume that the permanent teeth develop prior to appearing. He is almost four years old. Kim Loos Dr. Kimberly A. Loos practices general dentistry in San Jose, California. She is also a clinical instructor at University of Pacific School of Dentistry and an editor for Dentistry On-Line. Lack of sweat gland development is considered to be the most severe type of ED and is more commonly associated with dental anomalies.
Dental findings can be quite varied.
Most permanent teeth, except for wisdom teeth, complete the eruption process by about the age of 11 or 12. These teeth begin development quite a while before they erupt, however. A panoramic radiograph taken about the age of 8 or 9 should show whether or not all the permanent teeth are in the process of developing, where they are located, and if they have a typical shape. This type of radiograph is taken by a machine which rotates around the head of the patient. If it is determined that your son does indeed have some missing permanent teeth, treatment options are varied.