A proper clinical examination by a dentist will be required to ascertain the cause of oral ulcers in your case because they have been recurrent as well as multiple. The right treatment can be instituted only after a rational diagnosis has been established. It is not always possible to make the ulcers disappear faster but in cases like ulcers due to viral etiology, antiviral ointments can be beneficial for Rapid recovery. Physical or psychological stress and gastric upset or the other common reasons for oral ulcers. The guidance about any of these can be better discussed in detail after a proper diagnosis. For temporary symptomatic relief you can use topical ointments containing lignocaine or benzocaine. Some of these are available as over-the-counter medications. Regards.