First of all CIO doesn't advocate to let a child who is suffering or needs attention, like teething, to be left on their own, so you are in fact doing CIO and haven't altered it that much...so that's good. I would suggest that yes you keep going. I feel it is worth it. There will always be something, as you already mentioned, so if you give in now it will only continue. Even when he gets all his teeth in, then he'll be ready for a big bed or then he'll get his 2 year molars or then something else will change...so stick with it. It truly is worth it. Once you can cuddle, hug, kiss and plop them in bed your whole life will change! You might almost feel like a normal person again! ;) It's hard and sleep training has it's challenges, but honestly, I feel the best thing is to keep at it.