For mild oral thrush, no treatment is required. It will get cured within a week of two. You can try taking yogurt or over the counter drugs like acidophilus for getting treated. Make sure that you are using soft toothbrush and diluting the mouth with hydrogen peroxide solution. If you are diabetic, check your blood sugar level. In severe cases, your doctor may prescribe clotrimazole or some other lozenges. For people wih autoimmune disorders like HIV, your doctor may prescribe strong medicines like fluconazole. For breast-feeding mothers, you need to take antifungal medicine for protecting your baby.