Oral hygiene means cleaning one's mouth to keep it free from disease and other problems mainly by regular brushing and cleaning between the teeth. It is important that oral hygiene is carried out on a regular basis to enable prevention of dental disease. The most common types of dental diseases are tooth decay and gum diseases, including gingivitis, and periodontitis. Regular brushing consists of brushing twice a day: after breakfast and before going to bed. Cleaning between the teeth is called interdental cleaning and is as important as tooth brushing. Only 50% of the surface is cleaned because a toothbrush cannot reach between the teeth. There are many tools to clean between the teeth, including floss, fossette, and interdental brushes. It is up to each individual to choose which tool he or she prefers to use.