| Summary: | <b>Introduction:</b> Bruxism affects teeth and provokes sleep alterations. We evaluated whether saliva Myeloperoxidase (MPO) activity could be reduced after 21 neurofeedback training (NO) sessions in <i>Origanum majorana</i> (<i>AE</i>) bruxistic-treated patients (<i>n</i> = 12 patients, 120 saliva samples). The term divergence evaluates cerebral activity, which was compared between bruxistic patients with/without this essential oil exposure during 21 NO training sessions (<i>n</i> = 12, <i>n</i> = 120 saliva samples). The nasal filter used allow us to vehiculizate this <i>Origanum majorana</i> essential oil in patients. MPO activity was measured in six training NO sessions (Session S1, 6, 12, 18, 21). We included a total of 104 patients and 500 saliva samples. <b>Results:</b> there was a fast reduction in MPO activity after NO session-1 in bruxistic patients; divergence (an index of NO training brain efficacy) is the difference in cerebral activity found between pre-training and post-training levels. Thus, Divergence can fluctuate during NO training before reaching a final calm state after many sessions (21). Repeated NO training lead to habituation in so far as cerebral activity as well as MPO activity after 21 training sessions. <i>Origanum majorana</i> essential oil modulates cerebral activity at certain training sessions in bruxistic patients. Stress levels were reduced on the perceived stress scores (PSS: Cohen Scale) after 21 NO sessions than for those bruxistic without NO training sessions. <b>Conclusions:</b> MPO activity could predict stress level in bruxistic patients and repeated NO reduced their stress level; <i>Origanum majorana</i> essential oil enhanced these anxiolytic effects.
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