Hydroxyapatite toothpaste costs more, but experts say fluoride still wins on evidence

Consumers looking to avoid fluoride in their oral care routine now have a growing list of options, but they often pay a premium for the switch. Hydroxyapatite toothpastes, which use a calcium phosphate mineral to mimic tooth enamel, typically cost more than one dollar per ounce compared to standard fluoride products. While some consumers are drawn to the alternative due to personal preference or skepticism about water fluoridation, dental professionals caution that the scientific backing for the new ingredient is still developing.

Dr. Jin-Ho Phark, an associate professor of clinical dentistry at the University of Southern California, reports a steady rise in patient inquiries about these products. He attributes the surge in interest to social media marketing, where influencers heavily promote hydroxyapatite as a superior alternative. The traditional fluoride toothpaste, which became common in the late 1950s when Procter & Gamble released Crest nationally, has remained the standard for protecting teeth from cavity-causing bacteria for decades.

The debate over fluoride has gained momentum recently, partly due to public health figures like Health Secretary Robert F. Kennedy Jr., who has linked water fluoridation to various health issues including bone problems and neurodevelopmental disorders. However, Dr. Bennett Amaechi, a professor of dentistry at the University of Texas at San Antonio, notes that studies linking fluoride to lower IQ scores generally involve exposure to levels more than twice the U.S. recommended standard. The Centers for Disease Control and Prevention estimate that adding fluoride to public water reduces cavities by 25%.

Research comparing the two ingredients has produced mixed but generally positive results for the new mineral. A 2021 study in Scientific Reports followed 177 children for nearly a year and found that hydroxyapatite toothpaste prevented tooth decay as effectively as fluoride. A subsequent 2023 study in Frontiers in Public Health tracked 171 adults over 18 months and reached similar conclusions. Both studies received funding from the Dr. Wolff Group, a German company that manufactures brands of hydroxyapatite toothpaste.

Despite these findings, experts emphasize that the research base for hydroxyapatite is thinner than that for fluoride. Dr. Livia Tenuta, an associate professor at the University of Michigan School of Dentistry, points out that most studies have recruited participants with a low risk of tooth decay. She notes that there are very few long-term studies, particularly those involving individuals with severe oral health issues. A 2019 study in the Journal of Investigative and Clinical Dentistry did test the mineral on 133 people at higher risk of cavities, finding similar performance to fluoride after five months.

Mechanistically, the two ingredients work differently. Fluoride helps remineralize teeth by forming a new compound that acts as a shield for enamel. Hydroxyapatite, particularly in its nano-form, is thought to penetrate tiny crevices in the tooth surface to restore minerals. While the nano-particles are designed to enter enamel pores more easily, data on this specific mechanism remains limited.

For patients who are undecided, most dentists currently lean toward the traditional option. Amaechi advises using fluoride because it has a longer history of extensive research, including long-term studies. Tenuta agrees, stating that fluoride remains the best option given the volume of evidence supporting its efficacy. The American Dental Association acknowledges the growing use of hydroxyapatite products but maintains that the evidence for their clinical effectiveness is still limited and ambiguous.

The professional group continues to recommend brushing twice daily for two minutes with a fluoride toothpaste, flossing daily, and visiting a dentist regularly. As the market for hydroxyapatite expands, consumers must weigh the potential benefits of the mineral against the higher cost and the still-evolving body of scientific proof.