When it is properly used, the microwave is safe and convenient for heating a variety of foods in a short time. However, if you don't follow proper microwave safety, your appliance can cause painful burns and become a potential fire hazard. Before using a new microwave oven, make sure you know the correct operating procedures and safety precautions. In order to avoid the risk of a fire, you should never attempt to heat articles that are not approved for use in microwave ovens.