Have you had any luck yet? I dont know if this will help you, but this is what worked with my two kids (who were on the night time bottle long past 11 months!) I finally started watering down the night time bottle. I first started with about a quarter of it (maybe less) of it being water. It had to be just enough to thin it out without it being outright tasteing bad (Because then they would throw the bottle away from them and fuss). Then a few days later I would put even more water into it. Eventually they learned that the bottle wasnt tasting as good anymore, so they'd drink some of it for that 'soothing' feeling that they wanted from the sucking on it, but eventually it was mostly water and they didnt want that soothing-ness of it for long, with them eventually not wanting the bottle at all. They both would already take their milk in a sippy cup during the day so the contrast of the not as good tasting bottle at night really helped out alot.
Oh, and to address any "teeth issues" you may be concerned about. My Daughter was not a pacifier user, but son was. He was for several years and the extended use of the bottle/pacifier did not affect his teeth one bit. He has very straight, nicely formed teeth on both the uppers and the lowers. He's 5 1/2 now and has never had a cavity either.