Gingivitis is a common and mild form of gum disease that causes inflammation, redness, and swelling of the gums. While gingivitis is often discussed in terms of brushing and flossing habits, one question people frequently ask is: Is gingivitis contagious? The answer is yes and no. Gingivitis itself isn’t contagious in the way a cold or flu might be, but the bacteria that cause it can be transmitted from person to person. Understanding how this works can help you protect both your oral health and that of your loved ones.