I am 35 yo. When I had my panoramic xray at 22 I saw that my upper third molars were impacted, they are horizontally oriented with the occlusal surfaces of the crowns on the distal side of the second molars. My lower thirds are congenitally missing. By 27, I felt my upper right painful for a week or so, I reckoned the M3 was trying to come out of the gums but I didn’t see a dentist. Now, I have had pain again in my upper right and my bite seems different. Also I developed grinding and clenching which I never had before. I am thinking the third molar is the culprit. When I had my xray just now, it showed the M3 already slightly vertical but the crown is still touching my M2. The dentist said the M3 should be extracted but I am not sure whether the M2 has become carious where it is touched by the M3. Can the M2 be extracted and let the M3 erupt fully?