Reaccuring sore on side of my tongue , no teeth to rub on. stops hurting but never goes away, ?

Needs to be seen: I could give you a list of several possibilities but that won't help you. You should see your general dentist or an oral surgeon for a definitive diagnosis. Since this is a chronic situation, it is very important that it be diagnosed to make sure that it is not precancerous or cancerous. Even if not, it may require treatment.

Have it examined: And diagnosed. Lesions that do not heal require to be examined and treated.

Tongue sore.: You need to see a dentist asap about this. This is a common are for oral cancer to develop. The fact that it doesn't go away even though nothing is rubbing on it is not a good sign.