Quick summary: Extreme summer heatwaves in the UK significantly elevate the risk of oral diseases because heat driven dehydration reduces protective saliva flow and leaves teeth vulnerable to decay and gum problems. This vulnerability is further compounded by thermal shock to tooth enamel from temperature fluctuations and an increased seasonal consumption of sugary or acidic refreshments that accelerate bacterial growth. For healthcare practice and public policy, integrating proactive oral hygiene education into standard heatwave safety guidance is essential to protect vulnerable populations and support overall community well-being.
As the UK braces for the 3rd heatwave of the summer, with temperatures forecast to climb into the high 20°C and low 30°C across parts of England, dental experts are urging people not to overlook their oral health amid the extreme conditions.
While protecting skin with sunscreen, staying cool, and shielding eyes from bright sunlight are common priorities during hot weather, oral care is frequently neglected. Yet nearly 3.7 billion people globally suffer from oral diseases, conditions that can be significantly worsened by heat-driven dehydration and related climate factors.
Dr Pippa Nicholls, a dental expert at Dimples Oral Care, has issued an urgent warning to Brits. “The current UK heatwave is a good reminder that we need to prioritise our oral health, just as much as we do our skin, eyes, or hair in hot weather,” Dr Nicholls said. “Extreme heat often leads to dehydration, and when we’re dehydrated, our saliva flow can be reduced. Saliva plays a crucial role in protecting our teeth by neutralising acids, washing away food particles, and helping to remineralise enamel. Less saliva can mean a higher risk of tooth decay, bad breath, and gum problems.”
Dr Nicholls explained that temperature changes can also cause tooth enamel to crack due to thermal shock. Over time, teeth can feel more sensitive and appear more stained as they are exposed to these fluctuations.
Increased consumption of sugary and acidic refreshments in hot weather adds to the concern. “When we’re hot we also tend to reach for sugary drinks and snacks, such as ice cream or a flavoured iced latte. However, sugar hurts teeth. Bacteria love sugar, and the longer your mouth stays sweet, the more bacteria can flourish. This can lead to tooth decay, gum disease, and painful cavities,” Dr Nicholls continued. “Acid found in fizzy drinks, fruit juices, and wine will also contribute to the weakening of tooth enamel, which allows bacteria to access underlying tooth structures more easily.”
Dr Nicholls’ tips for protecting teeth this summer
Drink water regularly throughout the day
“Drinking water regularly rather than gulping in one go will help to encourage salivation and neutralise acids in your mouth. This helps to wash away food particles and remineralise enamel.”
Limit sugary sports and energy drinks
“Although it may be tempting to reach for cold fizzy drinks or energy drinks in hot weather, it’s important to avoid these where you can. These tend to be high in acids, which weaken tooth enamel. Instead, try sticking to water, or flavouring it with weak squash or natural flavours such as mint or cucumber.”
Be mindful of dry mouth when exercising
“If you’re going for a run or playing tennis outside, make sure you drink water regularly to avoid the mouth drying up. Again, this will help to boost hydration and saliva flow in the mouth.”
Eat sweet treats alongside meals
“Rather than eating an ice cream as a treat in the middle of the day, try to eat it at the end of a meal. That way, you are minimising the frequency and duration of acid attacks in the mouth, which damage tooth enamel.”
Keep up the minimum twice daily oral hygiene
“During hot weather, it’s really important to maintain our regular oral hygiene routine. That includes brushing twice daily, flossing every day, and gently scraping your tongue to help prevent bad breath. Using a toothpaste that contains hydroxyapatite will also help to strengthen your tooth’s enamel, reduce sensitivity, and support your gum health.”
Wider public health guidance
Public Health England and dental bodies continue to emphasise the importance of hydration and mindful consumption as temperatures rise, particularly for vulnerable groups including children and older adults. Maintaining oral health routines alongside general heatwave precautions supports overall well-being during warmer periods.