use your parental instinct if you feel that it is time to retrain him them you should try reverting back to when he was younger and using that approach i guess. sure there could be a problem, but i would also get the doctor involved with trying a few tests to see if there is truly a problem, maybe a few mind games "tests" could be in order. and maybe a night or two in the hospital could change everything. if the doctor confirms the need for them them i guess continue the use but if the doctor see's no need them discontinue at once.