This study was a randomized, placebo- controlled trial to comparative effectiveness of Myrtus communis and Melissa officinalis essential oil plants in the treatment of minor aphtous mouth that main conditions entry to study: 1- More than four days since the beginning aphthous ulcers they not passed. 2- Before go for treatment of aphthous lesions are not using. 3- at the time of presentation of pain and irritation of the pest canker sores, which in the early days of Genesis is not diminished. 4- Patients must agree to cooperate with the project ( Moral satisfaction ). Conditions of leaving study: 1- Another solution is to use the drug for the treatment of pests. 2- Not recommended to use the drug according to patient. 3- Not referring a patient for re- examination. In this randomized double blind study with continuous sampling method, 137 patients with oral aphthous more than four days of aphthous ulcers had passed the order referred to in one of the group A ( solution containing 5 percent Myrtus communis and Melissa officialiss in ethanol 80 ° ) and B (solution containing 10 percent Myrtus communis and Melissa officialiss in ethanol 80 ° ) or c ( including placebo containing ethanol 80 ° ) groups And long recovery time, were examined daily by doctors.