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.
2: Beijing Capital International Airport. This is important airport in China with this representation of 81,929,359 passengers in 2012, and second in the list as the busiest. In the area is considered the worldâs largest, with total 986,000 mÂ². And by Chinaâs busiest, serving Beijing.