Gingivitis is a common and mild form of gum disease, also called periodontal disease. It causes irritation, redness, swelling and bleeding of your gingiva, which is the part of your gum around the base of your teeth. It's important to take gingivitis seriously and treat it promptly. Gingivitis does not cause bone loss. But left untreated, it can lead to a much more serious gum disease, called periodontitis, and tooth loss.
The most common cause of gingivitis is not keeping your teeth and gums clean and healthy. Good oral health habits, such as brushing at least twice a day, flossing daily and getting regular dental checkups, can help prevent and reverse gingivitis.
Healthy gums are firm and pale pink. They fit tightly around the teeth. Symptoms of gingivitis include:

Gingivitis can cause bright or dark red, swollen, tender gums that bleed easily, especially when you brush your teeth.
If you notice any symptoms of gingivitis, schedule an appointment with your dentist as soon as possible. The sooner you seek care, the better your chances of reversing damage from gingivitis and not getting periodontitis. Your dentist may want you to see a periodontist if your symptoms aren't improving. This is a dentist with advanced training who specializes in treating gum diseases.
The most common cause of gingivitis is poor care of teeth and gums, which allows plaque to form on teeth. This causes swelling of the surrounding gum tissues.
Here's how plaque can lead to gingivitis:
Gingivitis is common, and anyone can develop it. Factors that can increase your risk of gingivitis include:
Untreated gingivitis can lead to gum disease that spreads to underlying tissue and bone, called periodontitis. This is a much more serious condition that can lead to tooth loss.
Ongoing gum disease may be related to some diseases that affect the entire body, such as respiratory disease, diabetes, coronary artery disease, stroke and rheumatoid arthritis. Some research suggests that the bacteria responsible for periodontitis can enter your bloodstream through gum tissue, possibly affecting your heart, lungs and other parts of your body. But more studies are needed to confirm a link.
Trench mouth, also known as necrotizing ulcerative gingivitis or NUG, is a severe form of gingivitis that causes painful, infected, bleeding gums and ulcers. Trench mouth is rare today in developed nations, though it's common in developing countries that have poor nutrition and poor living conditions.
To prevent gingivitis: