Dental decay, also known as dental caries, begins first inside the tooth. A white spot appears on the enamel where the tooth has started to weaken inside. At this stage, the tooth can repair the weakened area with the help of fluoride and minerals in saliva.
Beijing, also Peking, is the capital of the People's Republic of China and one of the most populous cities in the world. Its population in 2013 was 21,150,000. The city proper is the 3rd largest in the world.
Tours from Beijing. Beijing is located on the western coast of China on the Pacific Ocean. Beijing stands at the northern tip of the North China Plain. Tiananmen Square in the center of Beijing is situated at 39O56' North Latitude and 116O20' East Longitude. Beijing lies at approximately the same latitude as Philadelphia in the U.S. and Madrid in Spain. Greater Beijing has an area of 16,808 square km, and a population of 11 million.