The US supermarket giant Sam's Club is currently facing an investigation after a Chinese woman found a human tooth in a mooncake purchased from a branch.

A woman shared a Douyin video showing the tooth in a 30-yuan (US$4) meat-filled mooncake bought in Changzhou in eastern China’s Jiangsu province, reported South China Morning Post.

She said the tooth did not belong to any member of her family.

The woman said she informed about the incident to the police.

A staff member at Sam’s Club in Changzhou told the newspaper that the company was investigating the case.

The mooncake manufacturers told Hongxing News as quoted  by South China Morning Post that it is “impossible to have a tooth mixed in the meat filling.”

A spokesperson, identified by the surname Liu, explained to the newspaper that all meat undergoes mincing and is checked by an X-ray machine capable of detecting bone fragments.

The spokesperson said such an incident did not occur in a decade.

The government has also initiated an investigation into the matter.

This is not the first time when Sam's Club faced such a charge since in 2022 a woman claimed her uncle had found three artificial human teeth in Swiss rolls purchased from the chain.

The person reportedly broke his tooth after biting the food.

the chain promised a probe into the incident but no results were declared later.