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.
World Weather & Climate Information. Average monthly weather in Beijing, China. Beijing can experience intense weather throughout the year, with heat peaking during summer at 40 degrees Celsius (104Â° Fahrenheit), and it can drop to a cold -20Â° Celsius (-4Â°Fahrenheit) during winter. The city has four seasons.