When reheating food in a retherm oven, it is important to use safe containers that are designed for high-temperature applications. Safe container materials include glass, ceramic, and metal. Avoid using plastic containers as they may melt or release harmful chemicals when exposed to high temperatures. When selecting a container, ensure that it can withstand the temperature and time required for the particular food being reheated. It is also important to follow proper reheating guidelines to ensure that the food reaches a safe internal temperature before consuming. This includes stirring or rotating the food during cooking to promote even heating and avoiding covering the container with tight-fitting lids or wraps that can trap moisture and create an environment for harmful bacteria to grow.