For decades, fluoride has been considered the gold standard in caries prevention. Almost every toothpaste in our drugstores contains this active ingredient. However, while its protective effect against caries is scientifically proven, the discussion about potential risks of over-fluoridation is growing. Recent research and alternative active ingredients like hydroxylapatite raise the question: Does it really have to be fluoride – or are there safer, equally effective options?
The effect of fluoride – undisputed, but not unproblematic
Fluoride hardens tooth enamel by integrating into the outermost layer, making it more resistant to acids. Numerous clinical studies prove that fluoride-containing toothpaste can reduce the risk of caries.
However, there are several critical aspects:
- Synthetic origin: The fluoride used in toothpastes is not a natural mineral but is industrially produced from compounds such as sodium fluoride or sodium monofluorophosphate.
- Limited acid protection: Fluoride forms a superficial protective layer (calcium fluoride-like deposits). However, this protection is pH-dependent and can be rapidly dissolved again with repeated acid exposure.
- Dental fluorosis: In children during tooth development, even a regular excessive intake of fluoride (e.g., by swallowing toothpaste) can lead to white or brownish spots on the tooth enamel.
How does fluorosis develop biochemically?
Fluorosis is the visible sign of a disturbance in enamel formation (amelogenesis):
- During tooth development, fluoride ions are deposited into the mineralizing tissue.
- This alters the function of enamel-forming cells (ameloblasts) and inhibits the breakdown of organic matrix proteins.
- The result is faulty crystal formation in the tooth enamel – porous structures develop, which clinically manifest as white spots, and later as brownish discolorations or defects.
Hydroxylapatite: The natural building block of the tooth
In recent years, hydroxylapatite (HAp) has increasingly moved into the focus of research as an alternative to fluoride. It is the main component of human tooth enamel and bones.
Studies show:
- HAp can form a protective layer on the tooth surface and fill microscopic defects.
- It remineralizes damaged enamel and demonstrably reduces caries risks.
- It has an antibacterial effect by preventing bacteria from adhering.
- It is biocompatible and safe – swallowing it poses no health risks whatsoever, as it is a body-identical substance.
Why the debate is important
Advocates of fluoride argue that the substance has been used for decades and its effectiveness has been demonstrated in numerous studies. This is correct – however, this paradigm is based on a time when no equivalent alternative existed.
Today, however, with hydroxylapatite, there is an active ingredient that is:
- just as effective,
- completely harmless,
- and suitable for all age groups.
Conclusion: Time for a rethink
Fluoride has undoubtedly served dentistry well. But the risks of over-fluoridation, especially in children, are real and scientifically proven. With hydroxylapatite, an active ingredient is now available that offers the benefits of fluoride without having to accept its disadvantages.
Studies & Sources
Fluoride and fluorosis:
- Fejerskov O, et al. Dental fluorosis: A handbook for health workers. Munksgaard, 1996.
- DenBesten P, Li W. Chronic fluoride toxicity: dental fluorosis. Monogr Oral Sci. 2011;22:81–96. doi:10.1159/000327042
- WHO. Fluoride in Drinking-water. 2006.
- CDC. Dental Fluorosis Facts. 2020.
Limited acid protection of fluoride:
- Ten Cate JM. Fluoride mechanisms of action: a review. Acta Odontol Scand. 1999;57(6):325–329.
- Buzalaf MAR, et al. Fluoride and the oral environment. Monogr Oral Sci. 2011;22:1–15.
Hydroxylapatite as an alternative:
- Hannig M, et al. Effect of nano-hydroxyapatite on enamel surface roughness and microhardness in situ. J Nanosci Nanotechnol. 2013;13(8):4771–4777.
- Amaechi BT, et al. Remineralization of early caries by a nano-hydroxyapatite dentifrice. J Clin Dent. 2019;30(5):A1–A5.
- Paszynska E, et al. Comparative effectiveness of a hydroxyapatite and a fluoride toothpaste for prevention and remineralization of caries in children. Sci Rep. 2021;11:16618. doi:10.1038/s41598-021-95912-8