Yeast infection in the mouth is a yeast-like fungus that causes the yeast to grow and multiply rapidly. This infection can occur commonly because of uncontrolled diabetes, HIV or AIDS, chemotherapy drugs, and other medications. So if you have one of these conditions, it would be best to ask a medical professional about the risk of this infection to your health. The yeast cells produce an enzyme called “glucoamylase,” which breaks down sugar molecules into smaller units so the yeast can use them for food. This leads to the overgrowth of yeast cells and yeast infections in the mouth. Keep reading to learn more about oral yeast infection, its symptoms, complications, and treatments.