Botulinum Toxin Administration on Masticatory Performance

Inclusion Criteria: * Between 18 and 50 years old, * Male or female, * Able to communicate * Able to read and write * Volunteer to participate in the study, * At least 3 months of splint treatment and no results * Having Class 1 molar occlusion and not using removable prostheses * Marmara University, Faculty of Medicine, Department of Oral and Maxillofacial Surgery, patients diagnosed with bruxism or myofascial pain in masticatory muscles will be included in the study. Exclusion Criteria: * Sensitivity to botulinum toxin, * Have received botox treatment in the last 6 months, * Injection site infection * Pregnant or lactating women * Those with diseases that may cause systemic neuropathy such as diabetes, hypertension, kidney disease, * Those who do not want to sign the consent form, * Patients with a history of malignancy, radiotherapy or chemotherapy will be excluded from the study.