Could endanger health: Do not reuse baking paper too often. Do not exceed the maximum temperature in the oven of 220 degrees Celsius for the sake of your health.
If the baking paper becomes brittle or has a strong brown discoloration, it is better to replace it. If you prefer to use silicone mats or Teflon-coated baking foil instead of baking paper, you should also be careful. The EU is currently considering a ban on the chemical PFAS, which is suspected of being carcinogenic.