Microwaves are designed to be safe for cooking as long as they are used according to the manufacturer's instructions. The microwave radiation is contained within the oven and dissipates quickly when the appliance is turned off. Modern microwaves are equipped with safety mechanisms that prevent them from operating when the door is open. It is important to ensure that the microwave's door seals are intact and that the appliance is in good working condition to prevent any potential leakage.