For a four-month-old baby with white dots on his or her teeth, if you exclude milk flaps and other debris, the baby is most likely suffering from thrush. Thrush is a common disease of the oral cavity in infants of low months of age. It is caused by the infection of Candida albicans, which leads to lesions of the mucous membrane in the oral cavity, and is usually caused by the failure to disinfect and sterilize bottles, pacifiers, bowls and spoons, and mother’s nipples that babies come into contact with on a daily basis. Thrush may appear on the baby’s dental cavity or in other locations in the baby’s mouth. Once thrush is developed, the germs usually need to be controlled by the application of preparamycin. Thrush is more likely to recur, so it is recommended that the dishes your baby touches on a daily basis be cleaned, disinfected and sterilized.