Good thing you are fasting. Nothing but water should go in your mouth. That means no toothpaste or chewing gum, etc. to clean your mouth.
You got some good advice from the poster above. Try to eat as much raw and fermented foods after you break your fast. Yogurt, kimchi, sauerkraut and kombucha are good fermented foods. You can do Colon Cleanse and Liver Flush to get rid of bad bacteria.