Dental care includes the gums, teeth, and oral health. Gingivitis is an inflammation of the gums (gingivae), usually caused by bacteria. Periodontitis is a deeper and more serious inflammation of both the gingivae and tissue that surrounds and supports the teeth. Tooth decay is the gradual breakdown of the tooth, beginning with the enamel surface and eventually progressing to the inner pulp. Tooth decay is caused by acids produced by certain mouth bacteria in dental plaque. Factors that affect this process include oral hygiene, diet, meal frequency, saliva production, and heredity. The following conditions are related to dental care.