Gingivitis is a common and mild form of gum disease that causes irritation, redness, and swelling of the gums. It usually occurs when plaque, a sticky film of bacteria, builds up on the teeth and hardens. If not treated, gingivitis can lead to more serious dental issues, such as periodontitis, which can result in tooth loss. The good news is that gingivitis is often reversible with good oral hygiene practices. Brushing your teeth at least twice a day, flossing daily, and visiting your dentist regularly can help prevent and treat this condition. Maintaining a healthy diet and avoiding tobacco can also contribute to healthier gums.