The aim of the study was to study clinical and histological changes in the treatment of discoloration using different systems for professional tooth whitening. The study involved 76 patients. Patients of group 1 had their teeth whitened by the Amazing White Universal Extra photochemical activation system, and group 2 had their teeth whitened by the Beyond Polus system. Each group was divided into 3 more subgroups depending on the method of remineralization and the applied toothpaste (SENSITIVE ULTRA and SENSODYNE Rapid Relief). To assess teeth hyperesthesia before, immediately after and 14 days after the bleaching procedure, we used the prevalence index of teeth hyperesthesia, the intensity index of teeth hyperesthesia, and the Schiff sample. We also used a digital rating scale for patients. 100 teeth extracted for orthodontic indications were subjected to histological examination. The occurrence of hyperesthesia of teeth during professional bleaching was revealed in 100% of cases. Significant structural changes were registered in the enamel and dentin of the teeth, most pronounced during photo-whitening. The treatment based on zinc-substituted hydroxyapatite carbonate in combination with laserophonophoresis against the background of use the toothpaste SENSODYNE Rapid Relief had the greatest remineralizing effect.
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