Iron supplements are known to cause dark brown or black extrinsic staining of teeth, but this isn't anything that a good professional cleaning
won't eliminate. Meticulous oral hygiene will limit the degree to which this staining recurs.
It is uncertain, however, just how much intrinsic discoloration is present on the teeth. None of the medications are known to influence tooth enamel
formation; however, your son's health history might well have impaired the quality of the enamel on his teeth. The enamel on the permanent front
teeth form roughly between the ages of two and five years of age, and any metabolic disturbance during that time might cause a range of enamel defects-- discoloration, opacity, pitting, or other surface imperfections. These can be more difficult to manage.
Depending on the severity and type of enamel defects present, your son may need some type of restorative care-- perhaps porcelain veneers
or even crowns
. However, this type of treatment would not be appropriate until your son reached the age of about 18 years.
I generally discourage the use of bleach-type whitening systems for young children, especially if there is defective tooth enamel, because of the tendency to provoke tooth sensitivity
. Any benefit is temporary, so the necessity to repeat the whitening treatment poses significant opportunity to cause discomfort, and over time, the potential for further damage to the enamel.
I do believe that it would be worthwhile to discuss this issue with your son's dentist
, who can provide guidance while being better informed as to the nature of your son's cosmetic liabilities. Although I resist the urge to foist cosmetic dental
considerations on young children, I well realize how self-conscious children can be in this regard, and how cruel a child's peers can be at times. An empathetic dentist can provide suggestions for navigating the possibilities to address the cosmetic issues, while minimizing the potential for further damage to the teeth.
Hope this helps...