Children's medications can be flavored and sugary. If they stick on the teeth, the chance of cavities goes up. Children on medications for chronic conditions such as asthma and heart problems often have a higher decay rate.
Antibiotics and some asthma medications can cause an overgrowth of candida (yeast), which can lead to a fungal infection called oral thrush. Signs are creamy, curd-like patches on the tongue or inside the mouth.
Talk to your dentist about how often to brush if your child is taking long-term medications. It could be as often as four times a day.