Tooth brushing is the act of scrubbing teeth with a toothbrush, usually equipped with toothpaste. Interdental cleaning (with floss or an interdental brush) can be useful with tooth brushing, and together these two activities are the primary means of cleaning teeth, one of the main aspects of oral hygiene. History Teeth-cleaning twigs have long been used throughout human history. As long ago as 3000 B.C., the ancient Egyptians constructed crude toothbrushes from twigs and leaves to clean their teeth. Similarly, other cultures such as the Greeks, Romans, Arabs and Indians also cleaned their teeth with twigs. Some would fray one end of the twig so that it could penetrate between the teeth more effectively. The Indian method of using wood for brushing was presented by the Chinese Monk Yijing (635–713 A.D.) when he described the rules for monks in his book: Modern-day tooth brushing as a regular habit became prevalent in Europe from the end of the 17th century. The first mass-produced toothbrush was developed in England in 1780 by William Addis. In the United States, although toothbrushes were available at the end of the 19th century, the practice did not become widespread until after the Second World War, when US soldiers continued the tooth brushing that had been required during their military service. Reasons Brushing teeth properly helps prevent cavities, and periodontal, or gum disease, which causes at least one-third of adult tooth loss. If teeth are not brushed correctly and frequently, it could lead to the calcification of saliva minerals, forming tartar. Tartar hardens (then referred to as 'calculus') if not removed every 48 hours. Poor dental health has been associated with heart disease and shortened life expectancy. Many serious problems result from not maintaining proper oral hygiene. Not brushing teeth causes harmful bacteria to build up on teeth and gums. Bacteria growing in the mouth can infect the gums and then can travel into blood vessels. When gingivitis and periodontitis bacteria move into the blood vessels, it can cause inflation and damaged vessels. It clogs blood vessels, making it hard for blood to flow and can lead to blood clots, heart attacks, and strokes. Although the study at Harvard Medical School has observed "remnants of oral bacteria within atherosclerotic blood vessels far from the mouth," there are other factors including gender, alcohol consumption, diabetes, exercise, smoking, and family history of heart problems that could increase the risk