18+ Brown Stains On Baby Teeth. Whenever she wakes up in the middle of the night, she would ask for her water (in bottle). Tooth decay—tooth decay is a result of poor dental care and habits.
This stain can be from many different things.
Another possible culprit of white spots on baby teeth is fluorosis, the white staining that develops when children's developing teeth are overexposed to fluoride via drinking water or oral care. It may occur on the top part or the part you can see of a tooth (occlusal dental caries). An extrinsic tooth stain is a stain on the outer part of the tooth. I have light brown stains on my top front teeth, that have always been there because i had to have antibiotics when i was a baby.