The black discolouration could either be due to prolonged multi vitamin use or could be tooth decay. 1. Multi vitamins often have iron components in them which bind with saliva and are deposited as black pigments on the tooth surface. It is not harmful but certainly gives a bad appearance. Existing stains will go only after professional tooth cleaning. 2. Tooth Decay- If the discolouration is because of decay, your local dentist will be able to provide you with appropriate restorative solutions.

Dear practo user Black stain .due medicine would  be iron to NJ is or drop. If it'sso can get cleaned in dental clinic.

Pls attach a picture.  By looking at the nature of stain further can be discussed. Age of your daughter? Milk teeth had  similar stains?  How long stain is present.any medical problem..?

Hi... Black discoloration can be either tooth caries or simple stains (most likely). Please practice very good oral hygiene with t

It would be better if you post the pics of her teeth. It will be easy for us to diagnose.

The  reason for this may be use of long term multi vitamin syrups these syrups contain sweetners and are acidic in nature which makes the tooth enamel soft. Most of the vitamins comes with iron suppliments which may be the reason for blackish stain. Or may be  the blackish stain is caries. Visit dentist as early as possible to evaluate properly as its the eruption time for all milk teeth.