I weaned my little boy when he was just over a year old. The first week was tough, but I started a medication where I couldn't breastfeed any longer.
I offered plenty of fluids. Milk was always the 1st option I gave him. He was only allowed 4 oz. of juice every couple of days because if it was up to him that's all he'd drink. I also started a bottle and my husband would feed him. I also upped all his food intake, so he wasn't as dependent on the breast milk for nutrients. Within a week of not nursing him, he quit trying. It was harder on me than him. I miss nursing him--that was our special time.
If your little boy isn't ready to be weaned, why not work with him to stop gnawing. My little boy started biting a little around 6 months. When he'd hurt me, I'd simply tell him to stop. If he did it once more, then I ended the nursing. He quickly learned that if he wanted to nurse then he couldn't hurt me. He had 8 teeth by the time he was year old and he knew that mommy's breasts were not teethers. If he wanted something to chew on, then I'd give him a teether. If he wanted to nurse, he could.
Good luck to you.