Even if there is no milk (and there probably is at least a little - at least for whoever nurses first
)they are recieving emotional benefits. I think both of my girls were down to two short nursings a day by 16-18 months and I weaned them around 2 (madeline 22 months and Lilyka when my milk dried up during preg. and she was 26 months). They also had the benifit of a gradual weaning which i think helped make the transition easier.
Sorry about that teeth thing. Nothing you can do there. dd#2 bit me all the time (not just while nursing but since her teeth were there a lot my nipple turned into her favorite target
: ) and if she bit while nursing that was it untill my nipples felt like going near her teeth again Sometimes it was five minutes sometimes it was all day if she injured both of them.
You haven't failed. Not all children want to nurse untill they are 4. Not all children want to nurse until they are two. How many people can you name off the top of your head that didn't nurse one child untill the were 6 months? You have given abundantly to your children and you should feel nothing but pride regardless of what you decide.