DANIELA JUMANCA, ANAMARIA MATICHESCU, ATENA GALUSCAN AN EXPERIMENTAL METHOD OF PRODUCING HYDROXYAPATITE The main factor in maintaining oral hygiene is first and foremost the correct dental brushing and the use of proper sanitizing means: toothbrush, toothpaste, dental floss, mouthwash. Toothpastes containing hydroxyapatite have an increased efficiency due to the ability to re-mineralize dental enamel. In view of the appearance of the secondary reaction products, the most acceptable variant for HA production is the reaction between calcium hydroxide and phosphoric acid, because it does not result any undesirable side products at a pH > 9 units. The purpose of this study was to produce and then analyse the HA properties produced experimentally in the SETICO laboratories, using a device derived from the already patented: “Process and device for the production of nano-gels and micro-gels based on alkaline-earthy silicates” issued by OSIM Bucharest on 02.26.2016 No. 128 480.For the analysis of the HA emulsion the following devices were used: The zeta potential analyzer: WALLIS and the VASCO particle size analyser. The contribution of this method is that it provides information and results for the situation where pure hydroxyapatite is used without secondary reaction products. At pH = 7.21 there are particles of ~ 170 nm, very stable (Zeta-potential -133mV) and at pH = 12.64 there are particles of ~ 148nm and more stable (Zeta-potential + 359mV).