My brother says i should get treated because once in a while i get temporomandibular joint syndrome? is he right?

Maybe: If you have recurrent pain problems in the jaw, it should be evaluated by a dentist or ent, to ensure it is tmj, or what the diagnosis is. Most of the time, it is treated without surgery.

What symptoms: Your brother may be right, but depends upon what your symptoms are and the cause and duration. I would see a dentist or a tmj/tmd specialist, because your "occasional" once in a while symptoms may become chronic and not go away.

Maybe: If your symptoms are minimal and don't bother you much, no treatment needed.