We are all trying to cut back on sugar, and the market has never offered more alternatives. Stevia drops in your coffee, erythritol in your baking, a drizzle of honey on your porridge. But from a dental perspective, not all sweeteners are created equal. Some are genuinely tooth-friendly; others are just as damaging as the white stuff they replace, and a few sit somewhere in between. Here is how the most popular sugar alternatives stack up, ranked from least tooth-friendly to most, based on the latest research.
The Ones That Still Cause Damage: Honey, Maple Syrup, and Agave
Natural sweeteners like honey, maple syrup, and agave nectar are often seen as healthier choices, and in some nutritional respects they may be. But when it comes to your teeth, they behave almost identically to regular table sugar. All three contain significant amounts of fructose and glucose, which the cariogenic bacteria in your mouth, particularly Streptococcus mutans, ferment readily into lactic acid. That acid is what drives enamel demineralisation and, over time, cavity formation.
A 2024 review published in the Journal of Global Oral Health confirmed that sugar-free products, specifically those still containing fermentable carbohydrates regardless of their source, can lower salivary pH below the critical threshold of 5.5, the point at which enamel begins to dissolve. Honey is also viscous and sticky, meaning it clings to tooth surfaces longer than liquid sugars, extending the window of acid exposure. If you use these natural sweeteners, rinsing with water afterwards and giving your enamel time to remineralise before brushing are both sensible steps.
The Middle Ground: Stevia and Artificial Sweeteners
Stevia, derived from the Stevia rebaudiana plant, is a genuinely tooth-neutral option. The bacteria in your mouth cannot ferment it, so it does not contribute to acid production or cavities. Research published in BMC Oral Health in 2023 even found that stevioside may help reduce gum inflammation by modifying the oral bacterial composition and inhibiting Porphyromonas gingivalis, a key driver of periodontitis. That said, stevia offers no active remineralisation benefit; it simply does not make things worse.
Common artificial sweeteners such as aspartame, saccharin, and sucralose sit in a similar neutral position. They are not fermented by oral bacteria and therefore do not fuel decay. However, a critical caveat applies: many products sweetened with these compounds, particularly soft drinks and flavoured sparkling waters, also contain acidic additives like citric or phosphoric acid. Those acids erode enamel independently of any sweetener. The sweetener itself is not the problem; the surrounding formulation often is.
The Frontrunners: Erythritol and Xylitol
At the top of the rankings sit two sugar alcohols with genuine, evidence-backed dental benefits. Xylitol has the longer research record. A landmark meta-analysis examining over 70 studies, widely cited in dental literature, found that regular xylitol consumption reduced cavity incidence by between 30 and 50 percent. More recent 2024 follow-up research has shown it can also support early enamel remineralisation. The mechanism is elegant: S. mutans absorbs xylitol mistaking it for glucose, cannot metabolise it, and is effectively starved. With repeated exposure, xylitol has been shown to reduce the overall population of these harmful bacteria in the mouth, a benefit that outlasts any single dose.
Erythritol is the newer contender, and the evidence is catching up fast. Studies from 2023 demonstrate that erythritol prevents cavity formation at a level comparable to xylitol, and it carries fewer gastrointestinal side effects, which is a meaningful practical advantage. Like xylitol, it also has modest antimicrobial properties against cariogenic bacteria. For everyday use in foods, drinks, and chewing gum, both sugar alcohols represent the most tooth-kind options currently available.
How Your Toothpaste Fits Into the Picture
Choosing tooth-friendly sweeteners is one layer of protection, but what you brush with matters just as much. Hydroxyapatite toothpaste works by directly replenishing the calcium phosphate mineral that acid exposure strips away from enamel, making it a powerful complement to a low-sugar or smart-sweetener diet. Every time fermentable carbohydrates, however sourced, trigger an acid attack, your enamel loses mineral. Hydroxyapatite helps restore it. Used consistently, it keeps the remineralisation side of that equation working in your favour, regardless of whether your sweetener of choice is xylitol, stevia, or the occasional spoonful of honey.
The smartest approach combines both: choose sweeteners that do the least harm or, better yet, some active good, and support your enamel daily with a toothpaste that actively rebuilds what acid takes away.
Sources
- Kohli S, Singh G, Mathur S. Non-sugar substitutes: Effects on oral health. Journal of Global Oral Health. 2024;7:51-3. doi: 10.25259/JGOH_33_2023
- Han W, Jiao Y, Mi S, et al. Stevioside reduces inflammation in periodontitis by changing the oral bacterial composition and inhibiting P. gingivalis in mice. BMC Oral Health. 2023;23(1):550. doi: 10.1186/s12903-023-03229-y
- Zhu J, Liu J, Li Z, et al. The effects of nonnutritive sweeteners on the cariogenic potential of oral microbiome. BioMed Research International. 2021;2021:9967035. doi: 10.1155/2021/9967035
- Dentist Decoded. Sugar Alternatives and Your Teeth: Xylitol, Stevia, Erythritol Compared. 2024. dentistdecoded.com
