On the face of it, it seems a strange connection to make, but a recent study suggests that there is a link between endurance sports and dental problems, potentially leading to tooth decay. The study looked at a fairly small sample of 35 athletes and a control group of 35 non-athletes. Researchers found that athletes had a decrease in saliva quantity after exercise and an increase in saliva Ph levels, this led to an increased risk of dental erosion and tooth decay / rotting teeth. They also noted that there was a direct correlation between increased weekly running mileage and increased dental problems.
It seems that there is a need for endurance athletes to take extra care of their oral hygiene as they may be a higher risk group when it comes to tooth decay.