Tereshyna, T., and V. Pakhlevanzade. “The Teeth Whitening in an Age Aspect: Prevalance of the Method Use, Substantiation of Its Carrying Out and Possible Complications (clinical Research)”. Journal of Education, Health and Sport, vol. 11, no. 4, Apr. 2021, pp. 222-3, doi:10.12775/JEHS.2021.11.04.023.