Makes me wonder even more about what is in McDonald’s “food”
In 2015 A customer complained after making the discovery at an Osaka outlet in August. McDonald's said an independent probe had found it was a human tooth.
https://www.bbc.com/news/world-asia-30706243
In 2018 KANAZAWA (THE YOMIURI SHIMBUN/ASIA NEWS NETWORK) - Pieces of solid objects found in a McDonald's Sausage McMuffin with Egg sandwich in the fast-food giant's Kanazawa-Arimatsu outlet
I would check the customers other teeth to see if any of those were loose. I’ve seen teeth so loose that I would think a sneeze would blow them out.