As runners have just crossed the finishing line at the London Marathon last weekend, many people across the UK will be inspired and strapping on their trainers and getting out there to raise money for charity during this year's marathon season.

Running a marathon is an intense physical activity that requires months of preparation, dedication, and discipline.

While many people focus on the physical benefits of running a marathon, such as weight loss, improved cardiovascular health, and increased muscle mass, few consider the potential impact it may have on their oral health. However, recent studies have shown that running a marathon can have a significant impact on oral health, ranging from dehydration to dental erosion.

So with that in mind, we decided to take a quick look at how it impacts our smile.

When the body is dehydrated, it produces less saliva, which can lead to a dry mouth. A dry mouth increases the risk of tooth decay and gum disease because saliva plays a vital role in neutralising the acid produced by bacteria in the mouth.

Without enough saliva, these acids can erode tooth enamel and cause cavities. Additionally, a dry mouth can also cause bad breath, which is not something you want to be considering when you’re hugging friends and family once you cross the finish line.

Another factor that can contribute to oral health issues in marathon runners is the consumption of sports drinks and energy gels.

While these products can provide much-needed fuel and hydration during a race, they can also be highly acidic and sugary. The acidity of these products can cause dental erosion, which can lead to sensitive teeth, tooth decay, and discolouration.

Additionally, the sugar content in these products can feed the bacteria in the mouth, which can lead to cavities and gum disease.

Finally, running a marathon can also lead to stress, which can impact oral health in a variety of ways.

Stress can cause a range of physical symptoms, including teeth grinding, which can lead to enamel erosion and tooth sensitivity. Additionally, stress can weaken the immune system, making it more difficult for the body to fight off infections, including those in the mouth.