M.A.
My nephew has had 2 sets of tubes put in his ears and they may have to put a third set in. He was 13 months old with the first set of tubes and they instantly saw a change in his hearing ability. The number of infections also decreased. His second set of tubes was probably around the age of 4. One of the tubes has come out and the other is about to come out. He is now 6 years old and is still gets an ear infection a couple of times a year, sometimes quite painful. The doctors still think tubes are a good choice. So it's not unheard of, it doesn't seem to eliminate all infections but it does seem to decrease the number of them. Good luck!