Babies who develop yellow teeth should be aware if they have tetracycline teeth. A mother who has used tetracycline drugs during pregnancy, which can affect the development of her baby’s teeth, will have yellow teeth and should be examined at a dental clinic. If it is tetracycline teeth, there is not much that can be done. Also pay attention to whether it is dental fluorosis, if the drinking water is high fluoride caused, then you need to change the water source. In addition, babies should be brushed after their first teeth erupt. First of all, you can use a finger toothbrush to gently brush your baby’s teeth twice a day, morning and evening, to keep the mouth clean. In addition, you can drink a small amount of warm water after eating food, which can help rinse the mouth and relieve the occurrence of tooth decay.