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October brings plenty of opportunities to enjoy something sweet. Most people know that sugar contributes to cavities, but there is another part of the story: how often your teeth are exposed to it.
Bacteria in dental plaque use sugars from food and drinks to produce acids. Those acids cause enamel to lose minerals. Saliva helps neutralize acids and supplies minerals that can repair early damage; fluoride helps that repair process, too.
Repeated sugary snacks or sips mean repeated acid exposure. Over time, mineral loss can outpace repair and a cavity can develop. That is why reducing between-meal sugar exposure matters alongside reducing the total amount of sugar you consume.
Dentists describe this drop and recovery in acidity using the Stephan curve, a graph of the pH within dental plaque over time. A lower pH means a more acidic environment; pH 7 is neutral.
After sugar exposure, plaque pH can fall within minutes. As saliva helps clear sugars and buffer acids, the pH gradually rises again. Recovery takes time and varies with the person, the food or drink, and the plaque itself.
A pH of about 5.5 is commonly used to illustrate the “critical pH” for enamel: below this level, conditions favor mineral loss. It is an approximate guide, rather than a universal cutoff, because the mineral content of the fluid around the tooth also matters.
Another sugary snack or sip before recovery can send the pH down again. Repeated exposures can therefore extend the time teeth spend in conditions that favor mineral loss. The diagram illustrates why giving your teeth a break between sugary foods and drinks helps.
Illustration of the Stephan curve, not patient measurements.
For your teeth, the actual amount of sugar you eat really doesn’t matter. It’s the frequency that matters. Importantly, eating a meal stimulates saliva, which helps clear food and acids from your mouth.
The same principle applies to drinks. A sweetened coffee, soda or juice sipped over several hours creates repeated exposures. Water is a better choice between meals.
Chocolate generally clears from teeth more readily than sticky gummies or caramel. Hard candies that dissolve slowly prolong exposure, while sour candies add dietary acids that can damage enamel directly.
For families, a practical approach is to choose a small portion of favorite treats to enjoy with a meal, then put the rest away. The aim is to keep a bag of candy from becoming an all-day snack.
Brush twice daily with fluoride toothpaste. After bedtime brushing, avoid sugary food and drinks. Changing when you have sweets can help reduce risk, but it does not replace daily care.
At Park Blvd Dentistry, we can help you review your habits and find practical ways to protect your teeth. Enjoy your October treats—and give your teeth a break between them.
