Can I use peroxide to treat my cat’s gingivitis?

Dear Most Esteemed and Knowledgeable Kitties: 
Hi. I have an urgent question. My cat has been diagnosed with gingivitis and needs tooth removal. His mouth hurts so badly that he can’t eat hard cat food, just soft. Anyway, I’d like to treat his sore in his mouth. Can I put peroxide on it to help kill [...]