Early accesses can't always be seen on a x-ray. Specific symptoms and pain
also factor into the diagnosis and treatment. It would be prudent to have
your son seen by a dentist to evaluate the area of concern and make sure
the dentist get a radiograph.
I recommend this for patients who are sensitive to Sodium Lauryl Sulfate or any other ingredients in toothpaste. Using an electric tooth brush like a Sonicare will also help whiten your teeth.