We would recommend that you and your son speak to the doctor that is taking care of him. Without having all the details and exams for each patient, questions like these are better suited for the doctor whom you are seeing. With that being said, many people can experience symptoms of the healing process or even retracing for as short as a few minutes, hours, days, to even several weeks. Some symptoms can take several months or years to fully heal due to the time the Upper Cervical Subluxation has be present in that person. Each person heals differently and each person has lived with the Upper Cervical Subluxation for a different length of time.