SLS-free toothpaste – what does it mean and for whom is it a good choice?

Toothpaste without SLS does not contain Sodium Lauryl Sulfate, a detergent responsible for, among other things, foaming. It may be interesting for those experiencing oral discomfort or those who prefer less foaming formulas. The absence of SLS alone does not guarantee protection against tooth decay or ensure that canker sores will disappear — what matters is the full composition and your individual needs.

Last updated: September 17, 2026

What is SLS?

SLS, or Sodium Lauryl Sulfate, is a surfactant used, for example, in toothpastes.

It makes it easier to spread the toothpaste, helps with cleaning, and creates the characteristic foam during brushing.

However, it is worth remembering that the amount of foam is not a measure of a toothpaste's effectiveness. The most important factors for daily prevention are mechanical plaque removal and properly selected active ingredients.

Why were SLS-free toothpastes created?

For most people, the SLS used in toothpastes does not cause problems. However, there is a group of patients for whom it can irritate the oral mucosa.

Studies regarding people with recurrent canker sores are particularly interesting.

A systematic review including randomized clinical trials showed that in people suffering from recurrent aphthous stomatitis, the use of SLS-free toothpastes was associated with a reduction in the number of lesions, their duration, and the intensity of pain. The authors emphasized, however, that the number of available studies was relatively small and further well-designed studies are needed.

Therefore, SLS-free toothpaste is not a "better toothpaste for everyone." However, it may be a reasonable choice for a specific group of users.

Who might consider an SLS-free toothpaste?

People with recurrent canker sores

This is the group for which there is the most concrete data suggesting a potential benefit from giving up SLS.

People with very sensitive oral mucosa

If you regularly experience burning, irritation, or discomfort after brushing, it is worth looking not only at SLS but also at flavoring agents, essential oils, and other toothpaste ingredients.

People who prefer toothpastes with gentler foaming

SLS-free toothpastes may foam less intensely. For some users, this is unusual at first, but it does not mean less effective cleaning of the teeth.

Does SLS-free toothpaste protect against tooth decay?

The presence or absence of SLS alone does not determine protection against tooth decay.

SLS is primarily a detergent. Active ingredients and regular, proper brushing are much more important in caries prevention.

Fluoride remains an ingredient with very well-documented anti-cavity effects. The ADA recommends brushing your teeth twice a day with a fluoride-containing toothpaste.

There are also toothpastes on the market that use other active ingredients, such as hydroxyapatite. We described its effects in more detail in a separate guide: Nano-hydroxyapatite or fluoride? What the science really says.

How to choose a good SLS-free toothpaste?

It is not worth looking only at the large "SLS FREE" label on the packaging.

Also check:

1. Active ingredient

Think about what you expect from the toothpaste: cavity protection, hypersensitivity reduction, gum care, or remineralization.

2. Abrasiveness

The toothpaste should not be overly abrasive, especially if you have exposed tooth necks or hypersensitivity.

3. Flavoring substances

Sometimes the source of irritation is not SLS, but intense aromas, such as mint or cinnamon.

4. Your individual needs

There is no one best toothpaste for everyone. A product suitable for a person at high risk of tooth decay may differ from a toothpaste for someone with recurrent canker sores or hypersensitivity.

SLS-free toothpaste – is it worth it?

If your current toothpaste does not cause any discomfort, there is no need to give it up just because it contains SLS.

However, if you have recurrent canker sores or notice irritation of the mucosa, SLS-free toothpaste is one of the simple elements of your daily routine worth testing.

For frequent, painful, or long-lasting lesions in the mouth, you should consult a dentist or doctor instead of just changing your toothpaste.

How to identify SLS in the ingredients?

Look for the name Sodium Lauryl Sulfate in the INCI list. Sodium Laureth Sulfate, or SLES, is a different substance. Sodium Lauroyl Sarcosinate and Sodium Cocoyl Glutamate are also not SLS. Thus, an SLS-free toothpaste may contain other detergents; the term "detergent-free" is not synonymous with "SLS-free."

Do not judge a product's tolerance based solely on one ingredient. If you want to avoid a specific substance, check the current label of your chosen variant. Flavors and sizes from the same brand may have different formulas. You can read more about combining two criteria in the guide SLS-free and fluoride-free toothpastes.

Compare specific formulas

PrevDent nHAp 80 ml is an SLS-free and fluoride-free variant with nano-hydroxyapatite and potassium nitrate. Davids Peppermint 149 g is a mint toothpaste without fluoride or SLS; its INCI lists Sodium Cocoyl Glutamate. These are examples of differing compositions, not a ranking of effectiveness. Full information can be found on the product pages.

Frequently asked questions

Does SLS-free mean fluoride-free?

No. These are two independent features. You can choose an SLS-free toothpaste containing fluoride or a formula without both ingredients. A comparison of the role of fluoride can be found in the guide on fluoride and fluoride-free toothpastes.

Does SLS-free toothpaste cure canker sores?

It is not a medicine. Studies suggest possible benefits for some people with recurrent canker sores, but they do not allow us to promise results for everyone. Recurrent lesions require an assessment of the cause.

Does SLS-free toothpaste have to foam poorly?

No. Foaming depends on the entire formula, including other surfactants. More foam does not automatically mean better cleaning.

Does the label "natural" mean no SLS?

It does not replace checking the ingredients. Similarly, terms like "vegan," "whitening," or "for sensitive teeth" do not in themselves indicate which detergent was used.

Sources

• Alli et al., a systematic review of studies on SLS and recurrent canker sores (2019) — four studies, 124 participants; limited evidence base.
• American Dental Association: ingredients and selection of toothpastes.