Relevance. We have developed and patented a mobile application for monitoring and normalizing the mastication muscle functional state to solve the problems of detecting people with suspected dysfunction of the jaw muscles and increase the efficiency of muscle exercises.Purpose. To evaluate the positive effect of the mobile application to control and normalize the mastication muscle functional state in the clinical orthodontic practice.Material and methods. The study included 74 patients of Children Clinical Dental Clinic No. 2 of Voronezh, aged 6 to 12 years, who presented for a dental check-up. The masseter muscle tone was determined using the Mioton-3S device.Results. The authors’ method of self-examination does not give a systematic overestimation or underestimation of parameters (p = 0.083) compared to the standard myotonometry, which evidences its reliability and the possibility to use for preliminary examination and detection of people with suspected abnormal muscle tone. The analysis of the masseter muscles’ tone one month later revealed a statistically signifcant (p = 0.034) decrease in the number of patients with tone disorder among the mobile application users compared to the patients who did not use the application.Conclusion. The developed mobile application is efficient for preliminary assessment and detection of people with suspected abnormal muscle tone. Mobile application helps increase efficiency and awareness of muscle exercises.