One and a half year old baby teeth with black stains may be caries or pigmentation, can be removed by cleaning teeth, polishing and other methods. 1. dental caries: one and a half year old baby milk teeth are not fully erupted, but has added meat, eggs and other meat supplements, if the daily failure to pay attention to oral hygiene, or love to eat sweets, there will be dental caries, resulting in black stains on the teeth. Parents should often clean the baby’s teeth, especially the baby after meals to carry out appropriate mouth rinsing, to avoid further deterioration. 2. Hyperpigmentation: babies eating food with dark color will cause tooth or gum hyperpigmentation, appearing with black stains on teeth. It is recommended that parents usually let the baby eat less food with pigment, if necessary, can go to the dentist for polishing to remove the pigment. Baby teeth with black stains, parents should take their children to the doctor in a timely manner, perfect oral examination, clear cause, under the guidance of the doctor to give targeted treatment.