Small black stains on your kid’s teeth?

Is your kid's smile ruined by small black stains on his teeth? What are they?  They are not funguses, nor cavities or stains caused by nicotine or coffee. They are the so-called BLACK STAINS and mainly affect young patients, even though they can also affect adult patients and they often disappear spontaneously with growth. WHAT ARE THEY REALLY? They are dark ...