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Assessment of the effectiveness of botulinum toxin A in the treatment of temporomandibular joint pain dysfunction syndrome. In accordance with the diagnostic and treatment guidelines for TMJPDS, 20 patients with TMJPDS with pronounced pain on palpation of the chewing muscles, discoordination of the chewing muscles according to the EMG, and degenerative changes in the temporomandibular joint according to the MRI were examined. The patients had no contraindications to the use of botulinum toxin. 1) age under 21 years, 2)