However, Prof Ian Needleman, director of the International Centre for Evidence-Based Oral Health at University College London, says there could be an impact in elite sport.
He told the BBC: "It's the accumulation of marginal gains, where the difference between elite athletes at the very top is small. Then oral health, amongst other aspects, could make a difference.
"The research we did at London 2017 found a large proportion of young athletes, fantastically well tuned physically, had really poor oral health.
"Quite a high proportion reported an impact on their training and performance so it's clearly an issue for them."
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