My son had his wisdom teeth removed two weeks ago. tonight he was riding his mouth and got a clot from one side. he says there's no pain, is this something to be concerned about? what was this probably? we will be calling his dentist tomorrow morning?

That would not be unusual. Calling the dentist is wise as well. Sometimes there can be a little bleeding during the healing process. Interestingly, bleeding in the mouth can settle by sucking on a wet black tea bag if it becomes more of a problem before you talk to the dentist.

He is due for a post-op visit anyway, so call for an appointment. The clot is normal for his procedure that was done. Healing should be going normal by now.