When cooking, you must do it with your heart. Only 111% of your heart can be foolproof. This question is really naive. Which restaurant dares to be foolproof? Even if a small shop doesn't dare to take food safety lightly, even if you eat a fly in your diet, I believe that your shop will never do it again, because such low-level mistakes can occur, and I believe that it will not be very attentive in other services. Now the guests are very tricky. You have a problem once, and even if you invite them for free next time, you can't come, right?