If someone tells you that your child should have all of his/her permanent teeth before visiting the orthodontist for the first time, that “someone” is incorrect . In fact, putting off a first visit to the orthodontist until all of a child’s permanent teeth are in could do more harm than good.
Here’s why: There’s a lot more going on than meets the eye. A child’s mouth is a busy place.
Think about a 6-year-old. Everything is growing, including the bones in the jaw and face. At around age 6, the first permanent molars appear. An exchange of teeth begins as baby teeth fall out and are replaced by larger-sized permanent teeth. And it all happens in a predictable, particular order. Unless it doesn’t.
The gums hide about two-thirds of each tooth, as well as all the bone that hold teeth in place. The gums can mask conditions that interfere with the emergence of teeth.
Parents can watch for clues. Early or late loss of baby teeth can signal a problem. So can trouble with chewing or biting, speech difficulties and mouth-breathing. If these indicators are not addressed until a child has all of his/her permanent teeth and growth is essentially complete, correcting the problem may be more difficult than it might have been had treatment occurred earlier.
Source: American Association of Orthodontists