The Keto diet is indeed a trend. So is intermittent fasting. But how do these and other famous diets influence our teeth? 

We asked 1715 respondents from all over the world to share their opinions on 10 popular myths and facts about diets and teeth. Find out if they match experts’ statements. 


#1: Intermittent fasting may reduce the risk of cavities: FACT

If you have missed the trend, intermittent fasting is a regimen where you go between periods of eating and fasting – e.g. eating is allowed within 8 hours per day, followed by 16 hours of fasting. So can this diet reduce the risk of cavities? According to 48% of DentaVox survey respondents, the answer is yes. 

And experts agree. The main reason: Not exposing your teeth to food acids for part of the day gives your oral health a break from fighting the cavity-causing bacteria. 


#2: The vegan diet is always dangerous for oral health: MYTH

From a very young age, children know that milk, cheese, and yogurt are friends to their teeth due to the calcium content. Does that mean that vegans – people who do not consume animal products – are destined to bad oral health? One-fourth of DentaVox respondents think so. 

But this is a proven myth that might become true only if vegans do not pay attention to the nutrients in the food they eat. In fact, almost all crucial elements your teeth need can be obtained from vegan products too. See examples below. 

vegan foods good teeth dentavox blog


#3: The coffee diet can lead to enamel erosion: FACT

The coffee diet has become a hit in recent years with its advocacy of drinking a cup of black coffee after every meal, as well as before bathing and exercising. The bold promises are better metabolism, suppressed appetite, and fat burning effects. 

And although its particular impact on body shape is yet to be scientifically proven, one thing is for sure: Drinking large amounts of coffee could lead to enamel erosion (56% of DentaVox respondents correctly recognized this risk), bad breath, and teeth yellowing. Doctors recommend drinking plenty of water if you decide to give this diet a go – it helps protect your teeth from the high acid levels while also keeping you hydrated. 


#4: The alkaline diet ensures high mouth pH: FACT

Over half of DentaVox survey participants recognize the alkaline diet as helpful in improving pH levels. Quick recap: The pH level measures your acid/alkaline balance and it should be 6.2-7.6 to keep your teeth and gums healthy. 

The alkaline diet restricts acidic foods like grains, sugar, dairy, fish, meats, and relies on highly alkaline foods (pH>7) such as fresh fruits and veggies, beans, lentils, nuts, oils.  


#5: Diet drinks are better for teeth: MYTH

Tale as old as time… No, diet coke is no better than normal coke. But it seems the majority of DentaVox respondents (47%) still believe this myth.

In fact, it’s not only sugar that damages your teeth. Fizzy drinks are highly acidic, regardless of the sweetener used. Over time sugar-free drinks can cause just as much tooth erosion and cavities as sugary drinks. 


#6: Fast food has a negative impact on teeth: FACT

Fast food has been a symbol of generations and nations. Its negative influence on the entire body has been widely discussed with diseases like diabetes type 2 and heart attack being scientifically linked to fast food consumption. 

But does that have anything to do with oral health? According to 65% of survey participants, the fast-food diet harms teeth as well. Experts certainly agree. Check out the main reasons below. 

fast food bad teeth dentavox blog


#7: A gluten-free diet helps with absorbing calcium better: MYTH

There might be other good things about going gluten-free but absorbing calcium better is not one of them. The majority of DentaVox survey participants (53%) are not aware of that. 

Research shows that coeliac disease – which requires a 100% gluten-free diet – is often accompanied by calcium deficiency. In the case of non-celiac gluten sensitivity, absorption of calcium is not compromised but foods consumed may be low in calcium, thus requiring people to pay closer attention to obtaining the right amount of calcium and other nutrients through their food or supplements. 


#8: The Paleo diet is related to sticky teeth: FACT

The Paleo diet promotes eating anything that our hunter-gatherer ancestors ate. It is predominantly whole-food and plant-based but allows for lean meats and fish as well. This diet restricts sugary and starchy foods which makes it good for your teeth’s health. 

One potentially bad thing about it is that limiting grains usually leads to eating more fruits which, therefore, can cause sticky teeth. A fact that is not so popular, so unsurprisingly, DentaVox respondents’ answers are diffused. Make sure you consume large amounts of water and maintain good oral hygiene to avoid problems. 


#9: Olive oil prevents bacteria from attaching to teeth: FACT

Almost 60% of survey participants correctly recognized the feature of olive oil – very prominent in the Mediterranean diet – to hinder bacteria from sticking to your teeth. 

Researchers at the University of Madrid discovered olive oil’s antibacterial oleuropein when they looked into the reasons why people who lived near olive oil manufacturing plants had low incidences of gum disease.


#10: The ketogenic diet may lead to bad breath: FACT

According to 42% of DentaVox respondents, the popular keto diet leads to halitosis (or bad breath). And this is a fact. Let’s look at the reasons.

The ketogenic diet cuts down on carbohydrates and thus, the body burns fat instead of carbs. This leads to ketones development – a type of chemicals, usual to our bodies, whose effects, however, are not so noticeable when you burn an equal mixture of fats and carbs. While on a keto diet, the body enters an extreme fat-burning mode which causes bad breath. Drinking plenty of water or chewing gum could help you deal with the issue temporarily. 


Which of those myths and facts were you aware of?

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Stats source: DentaVox, 20 Questions: Diets & Teeth
Base: 1715 respondents (global sample)
Period: 03/12/2020 – 18/01/2021