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.
Beijing (åäº¬ BÄijÄ«ng) is the capital of the most populous country in the world, the People's Republic of China. With a population of 21.5 million people, it is the nation's second-largest city after Shanghai.It was also the seat of the Ming and Qing dynasty emperors until the formation of a republic in 1911.ne-way fare is Â¥25 and the trip takes about 20 minutes from T2 to Dongzhimen Station, about 30 minutes from T3. Although the last Airport Express train leaves airport to city at around 23:10, the subway lines normally stop operating before 23:00 on weeknights.