I just went through this with my now 17 month old so I feel for you. When my son was 14 months he too was getting up every couple hours and wanting to nurse. I realized things had to change when I found myself barely able to take care of my 3 kids during the day. So, I decided to gradually wean him off his night feedings. First, I let him nurse twice during the night and then offered a sippy cup the other times he wanted to feed. He cried a little the first night or 2, but I just held him until he would go back to sleep. When he started taking the sippy cup after 4 or 5 days and fighting to nurse less, I would nurse him just once a night. The once a night nursing went on for a week and when he seemed to adapt, I began to offer the sippy cup until about 5 am and then I would nurse him once. He'd usually go back to sleep for a couple hours after that. Finally 2 weeks later he was no longer begging for night feedings. He didn't really sleep any better after weaning from night nursing, but I felt less worn out in the morning even if he woke every couple hours. I found that sometimes he did need food during the night so I would feed him either cold blueberries or grapes or a Go Gurt which he loved. He'd usually sleep a little longer after that.
Teething is tough for my kids and they never sleep through the night until after the last (20th) tooth is in between 18 months and 2 yrs. My little guy still doesn't sleep more than 3 or 4 hours straight most nights though he has recently slept 7 hours. I'm hopeful that someday I will sleep (and you too). My older 2 kids were exactly the same as my youngest but now at ages 3 and 6 both are sleeping 10-11 hours straight at night.
Keep nursing till you are both ready to quit. Don't worry to much about teeth. My little guy weaned at 16 months and he had 16 teeth and though he did bite once or twice, he learned quickly. When babies/toddlers bite during nursing, I say, "No bite!" firmly and take them off the breast. Then I wait 2 or 3 minutes before putting them back on. If they bite again, I end the nursing.
Hope this helps. Midwife mom of 3