The news, confirmed by McDonald's today, comes two days after the company admitted several foreign objects had been found in food at Japanese outlets, including a human tooth in a container of french fries at an outlet in Osaka.
An unidentified woman told the Asahi television network she had found three tiny fragments of what looked like teeth in a burger she bought at a McDonald's in northern Kushiro city in September.
"I can't help thinking that it was (already) in the meat."
A third-party examination determined the opaque white fragments were "dental material", according to company spokeswoman Miwa Yamamoto, saying the substance is commonly used to fill cavities or in other dental work.
McDonald's, however, would not confirm the woman's claim that the fragments were inside her burger.
Yamamoto said the customer was told that there was an "extremely low chance" it could have fallen into raw material, given the highly-mechanised process.
On Wednesday, McDonald's acknowledged a human tooth had been found in fries sold by another outlet last year, while it has also been hit by incidents in which pieces of vinyl were found in chicken nuggets and a tiny piece of hard plastic in a sundae.
Japanese media reported several other cases of contamination, including a piece of metal in a pancake.
The incidents mark another public relations setback for the firm, which is struggling to recover from a battering to its reputation this summer when a Chinese supplier was found to be mixing out-of-date meat with fresh produce.
Labour disputes on the US West Coast had bunged up the export chain, leaving Japanese firms scrambling to secure fresh supplies.
The difficulties looked set to hit McDonald's bottom line, with the Japanese unit earlier saying it was on track to report a 17 billion yen (USD142 million) annual loss for 2014.
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