Exercising is good for the body and running provides a range of health benefits: lower BMI, improved immunity and six years longer lifespan on average. But it is not only good to jog several hours a week. Because running is harmful to your teeth.

Those who exercise much have far more cavities than those who do not exercise.

It is Scandinavian researchers who have come to the conclusion, published in PubMed. They did partly by taking saliva sample from runners and discovered that the acid content was different. The result corresponded with former British studies.

At first, the scientists thought the cavities could be caused by the sugar content in sports drinks and energy bars, but they gradually discovered that it was the body's own chemical balance that was in disorder, which led to dry mouth and thus greater risk of acid damage to the enamel.

The participants in the study exercised about nine hours a week, and thus well above the average - but the advise also applies to those who exercise less, yet regularly:

Flush your mouth with water after you finish the session, to minimize the acid damage.

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