Herbal Toothpaste: A Critical Review of Formulation Design, Quality Evaluation, Clinical Evidence and Safety Gaps

Herbal toothpastes are promoted as milder, safer alternatives to conventional dentifrices, and a growing number of small formulation studies describe them as stable and effective. This review asks whether the published evidence actually supports those claims. Formulation studies, quality standards, laboratory investigations, clinical trials and safety reports on herbal dentifrices and their common ingredients, such as neem, clove and turmeric, were examined and compared. Most formulation papers evaluate a single batch using simple organoleptic and physicochemical tests, while abrasivity, fluoride content, cytotoxicity and long-term stability are seldom measured by recognised methods. Laboratory work often reports strong antibacterial activity, yet the most potent preparations may also damage human cells, so antimicrobial strength alone is a poor guide to safety. Clinical trials suggest that short-term plaque control is comparable to conventional pastes, but the studies are small, brief and of low methodological quality. Several commercial products contain little effective fluoride, and irritant foaming agents are frequently retained in herbal bases. A plant origin therefore does not guarantee quality, efficacy or safety. A minimum reporting framework covering standardised plant material, validated physicochemical and abrasivity testing, fluoride declaration, cytotoxicity screening, biofilm-based antimicrobial assays and controlled clinical assessment is proposed for future work.