It's generally not recommended to use a metal spatula on nonstick pans, as it can potentially damage the nonstick coating. Nonstick pans are typically coated with a layer of polytetrafluoroethylene (PTFE), commonly known as Teflon, which is a soft material that can be easily scratched or scraped off by metal utensils.
Using a metal spatula or any other metal utensil on a nonstick pan can create scratches or abrasions on the surface, compromising the nonstick properties and making the pan more prone to sticking. Once the nonstick coating is damaged, food can stick to the pan, and it becomes more difficult to clean.
To maintain the integrity of your nonstick pans, it's best to use utensils made from non-abrasive materials such as silicone, nylon, or wood. These materials are softer and gentler on the nonstick surface, minimizing the risk of scratching or damaging the coating.
If you do accidentally use a metal spatula on your nonstick pan and notice scratches or flaking on the surface, it's advisable to replace the pan. Cooking with a damaged nonstick pan can potentially release harmful chemicals or particles into your food.