The textbook opinion: hydroxyapatite reduces sensitive teeth
Sensitive teeth are painful and can restrict quality of life. Both warm food and drink as well as cold food, such as ice cream, can trigger an uncomfortable feeling when consumed. The hypersensitivity is caused by the dentine with its open tubules being fully exposed. This could be due to receding gums or a lack of enamel due to erosion etc. Dentinal tubules develop during tooth development: the tooth-forming cells, called odontoblasts, shift from the pulp to the crown, allowing the dentine to grow. These shifts in odontoblasts remain even after tooth development. These are called dental canaliculi. Stimuli can reach the pulp through these small passages and trigger a transmission that leads to a reaction in the body (pain).
There are many approaches to treat hypersensitive teeth: inhibiting the action potential of nerves with potassium toothpastes and sealing the tubules with various compounds (strontium salts, arginine calcium complexes, silicates etc.). Hydroxyapatite also pursues this aim, and very efficiently. High-resolution scanning electron microscope (SEM) images show that all dentinal tubules are almost completely sealed with hydroxyapatite microcrystals. The application of hydroxyapatite in mouthwashes and other oral care products could be clinically confirmed several times. An effect can be measured after just a few days of application.
Hydroxyapatite is ideal for treating patients with pain-sensitive teeth. The exposed dentinal tubules are sealed and prevent the stimulus from being transmitted.
The publication of the study can be found here.
Source: Gillam, D. G. (2015). Dentine hypersensitivity: Advances in diagnosis, management, and treatment, Springer International Publishing.