I had my 3 removed at 19, because they were pushing other teeth and causing me pain. I didn't have room in my mouth for them. I went to an oral surgeon and was put out, which is best because if they are impacted (still within the gum tissue) then it could get scary hearing bone cracking, feeling the pressure to wedge them out, and not to mention the Dr's tools! I know this because I later started working for an oral surgeon. If you leave them, they can settle and not move for a while (or for the rest of your life, depending on how much room you have and how crazy the roots on them are. Some roots can be twisted around roots of other teeth next to them), which will relieve the pain, however, they may start moving again, probably dig themselves deeper, and the pain will come back. Look for a good oral surgeon with good history.