#asktheexpert Hi sir, My baby used to suck her thumb, there is black spot due to this and her front teeth are there (6) so sometimes she bites her own thumb. i am really worried about this, could you please guide me on how I can stop this habit of her ? Thanks in advance!!

A. baby teeth can become discolored for many reasons, including: 1.inadequate brushing. if baby teeth aren't brushed properly. bacterial infection can cause such black staining of tooth due to decay. 2.medication use. infant medications containing iron, such as supplemental vitamins, might cause stains on baby teeth. 3.tooth injury. a single dark tooth could be the result of bleeding within the tooth due to dental trauma. 4.illness. long standing disease illnessf as well as nutritional deficiencies can cause pigmentation of the tooth.