Also, you should inform your dentist about it. You need to
be aggressive
in preventing further cavities
in your mouth. I would recommend using prescription toothpaste (or toothpaste designed for dry mouth), prescription mouth wash, a fluoride tray (for overnight fluoride use), carry a bottle of water around everywhere you go, chew sugarfree xylitol gum to stimulate your salivary glands during the day, etc. Your dentist may have other suggestions as well.