Infants with a black tongue need mouthwash with mouthwash or stop using antibiotics. Normally, the color of an infant’s tongue is pink. The darkening may be a deep staining of the tongue, or a bacterial infection that causes the filiform papillae to multiply and turn black. Or it may be caused by the abuse of antibiotics. The black tongue of infants may be a kind of staining from eating black things, such as eating foods like chocolate, or eggplant, etc. This condition does not require treatment, and can be removed by rinsing the mouth with water. The black tongue of infants may be caused by bacterial infection of the filiform papillae of the tongue, an infectious disease, you can use a mouthwash containing metronidazole to rinse the mouth. Also brush your teeth well to maintain oral hygiene. The baby’s black tongue may be caused by the baby’s gastrointestinal tract indigestion, usually you can eat some easily digestible food, or use ginseng and white atractylodes to improve the digestive function of the gastrointestinal tract. Some of the black tongue of infants is also related to the abuse of antibiotics. Antibiotic abuse leads to dysbiosis and a black tongue. In this case, you need to stop using antibiotics and take oral lactobacillus tablets to regulate the flora. So infants with black tongue should maintain oral hygiene, use metronidazole mouthwash with rinse, or lactobacillus tablets to regulate the gastrointestinal tract.