How do you tell if plastic is safe to reuse?

To determine if plastic is safe to reuse, check for recycling symbols on the bottom of the container, particularly those marked with numbers 1 (PETE), 2 (HDPE), and 5 (PP), which are generally considered safer. Avoid plastics marked with numbers 3 (PVC), 6 (PS), and 7 (other), as they may contain harmful chemicals. Additionally, inspect for any signs of wear, such as cracks or discoloration, as these can harbor bacteria or release toxins. Always wash and sanitize reused plastics before use.