Should the catering industry ban the use of steel balls?

It should be banned in the catering industry. I often eat a small piece of this thing outside or in the company canteen. Before this festival, colleagues in the unit ate it in their stomachs, and then found that there was still a small steel ball left in the dish. After reporting to the canteen leader, he went to the hospital for filming. Copper or stainless steel brushes should be used!