The application of a few drops of grapefruit seed extract dissolved in water on the gum line with a cotton ball can also help in keeping your dog's teeth clean. (dogplaqueremovaltips.com)
I like to add grapefruit seed extract in as a little extra kick to prevent that from happening. (mindbodygreen.com)
You can also try a home remedy such as grapefruit seed extract diluted with water. (dog-health-guide.org)