Hi D.,
He may well be too young to stop that bottle before bed. My son is almost 2 and still has one right before going to sleep, and his teeth are fine--he brushes at least twice a day including right before the bedtime routine, and we haven't had problems. Babies your son's age especially need to "tank up" to sleep through the night. He needs those calories and as long as you're instilling good oral hygiene now that his teeth are coming in and not allowing him to fall asleep with the bottle in the crib (and therefore nursing it through the night and letting milk pool and sit in his mouth, which CAN cause tooth decay), you'll be fine. Don't deprive him of the calories and the comfort so young. It's not necessary or worth the other costs--not sleeping through the night, throwing off his daytime eating & sleeping routines, etc.
BTW we found Tracy Hogg's book "The Baby Whisperer Solves All your Problems (By Teaching you HOw to Ask the Right Questions) very helpful with sleep & eating issues. We actually "dream fed" our son until he was around 1--that is, went into his room around 11pm and gave him a bottle IN HIS SLEEP to give him the calories he needed to sleep through the night--and like I said above, no oral hygiene problems. And BTW, now he sleeps like a champion 11-12 hours a night and hardly ever needs help to get back to sleep when he wakes during the night, so these practices will not interfere with good sleep hygiene either, if you do them right.
Good luck!
K.