No fluoride-free toothpaste category has evidence comparable to fluoride for cavities

The alternatives to conventional toothpaste divide cleanly along the line of what they have been tested for. Oil pulling and the chewing stick known as miswak have real, if short-term, randomised data showing reductions in plaque and gum inflammation [s2]. Charcoal dentifrices have essentially none — a review for the Journal of the American Dental Association found not one clinical trial meeting basic inclusion criteria [s1]. And across the whole fluoride-free category, a 2026 scoping review of 122 studies concluded that no formulation has evidence comparable to fluoride for long-term caries prevention in children [s3].

What the traditional practices have going for them

A 2026 systematic review in Oral Health & Preventive Dentistry searched five databases up to April 2024 for randomised and quasi-experimental studies comparing traditional oral hygiene methods with conventional practice, and included 31 studies [s2].

Miswak came out best. It significantly reduced plaque accumulation and gingival inflammation, performing comparably to or better than conventional toothbrushes [s2]. Herbal dentifrices and mouthwashes containing neem, clove, turmeric and ginger showed antimicrobial properties and were as effective as fluoridated products in reducing plaque and gingival inflammation [s2].

Oil pulling — swishing sesame or coconut oil in the mouth — showed moderate reductions in microbial load and improved gingival health, though findings varied when compared against chlorhexidine mouthwash [s2]. That is a genuinely positive result and a limited one. The outcomes measured were microbial counts and gingival indices over short periods, not decay. Indigenous methods more broadly, including finger brushing, twigs and charcoal, were noted as offering accessibility and sustainability benefits while lacking extensive clinical validation [s2]. The review's own conclusion asks for caution: methodological limitations and variability among studies necessitate cautious interpretation, and further research is needed [s2].

Two things are worth separating here. Plaque and gingivitis are surrogate outcomes that respond to almost any mechanical or antimicrobial intervention within weeks. Caries takes years to measure. A practice that matches fluoride toothpaste on plaque has not been shown to match it on cavities, because those are different experiments and only one of them has been run.

Charcoal is the weakest case in the aisle

The JADA review searched MEDLINE and Scopus through February 2017 for clinical studies of charcoal and charcoal-based dentifrices and for laboratory work on their bioactivity or toxicity, using a defined strategy to identify randomised controlled trials with follow-up of three months or longer [s1]. It also pulled the first 50 consecutive charcoal dentifrices listed on Google.com and Amazon.com to catalogue what was actually on sale [s1].

The search identified 118 potentially eligible articles [s1]. Thirteen studies reported brushing teeth with raw charcoal or soot — and none of them met the inclusion criteria [s1]. Of the studies that could be characterised at all, two offered non-specific caries reductions, three reported deleterious outcomes including increased caries, enamel abrasion and a non-quantified negative impact, and one indicated only that brushing with raw charcoal had no adverse effects on oral hygiene [s1]. Seven others reported merely on the use of charcoal for oral hygiene [s1].

The product survey found internet advertisements making unsubstantiated therapeutic claims — antibacterial, antifungal, antiviral, and oral detoxification — alongside potentially misleading product assertions [s1]. One-third of the charcoal dentifrices contained bentonite clay, and one contained betel leaves [s1]. The review concluded there were insufficient clinical and laboratory data to substantiate the safety and efficacy claims made for these products [s1].

That review is now several years old, and the products have proliferated since. What has not appeared in the interval is the trial evidence it called for.

The fluoride-free question, mapped

The most complete recent look at the category comes from a 2026 scoping review in the European Journal of Pediatrics, which searched for studies of fluoride-free toothpaste formulations published between January 2020 and March 2026 and included 122 [s3].

The composition of that literature is the finding. It was predominantly laboratory and mechanistic work, with only 20 studies providing direct paediatric evidence [s3]. Fluoride-free formulations were associated with antimicrobial activity, biofilm modulation and surrogate remineralisation outcomes; direct assessment of clinical caries outcomes was uncommon, and heterogeneity in formulation, design and outcome selection was substantial [s3].

The authors' summary is precise about where that leaves things. Fluoride-free formulations demonstrate measurable biological effects, but the evidence is dominated by surrogate outcomes and short-term designs [s3]. Hydroxyapatite-based products have the most consistent evidence base of the alternatives — and still no fluoride-free category has evidence comparable to fluoride for long-term caries prevention in children [s3]. The review also observes that across formulations, the observed effects are driven more by study design, delivery context and outcome selection than by the specific ingredients [s3].

What that adds up to

There is nothing in this literature suggesting that oil pulling or a miswak stick is harmful, and there is short-term evidence that both do something measurable to plaque and gums [s2]. There is also nothing showing that any of them prevents tooth decay over the timescales decay operates on, and for charcoal specifically the reviewed evidence includes reports of enamel abrasion and increased caries alongside the marketing claims [s1].

The distinction that matters is between an intervention that has been tested against the outcome people care about and one that has been tested against something easier to measure. On cavities, fluoride has the first kind of evidence and its alternatives have the second [s3].

This article describes published research and is not dental advice. Questions about which products suit a particular mouth, and about caries risk in children, belong with a dentist.