State Route 520 Bridge: Also known as the Evergreen Point Bridge, it is the longest floating span in the world. It also produced some of Seattle area's longest traffic jams until the state began tolling the bridge again for the first time in 30 years last December.
Tooth decay is damage that occurs when germs (bacteria) in your mouth make acids that eat away at a tooth. It can lead to a hole in the tooth, called a cavity. If not treated, tooth decay can cause pain, infection, and tooth loss. A tooth has three layers. The hard outer layer is called enamel.
Tooth decay begins when the outer surface of the tooth is attacked by acid. The acid is produced by bacteria which live on the surfaces of the teeth as a layer called plaque. When foods or drinks containing sugars enter the mouth, the bacteria within the plaque rapidly convert the sugars into acid.he acid is produced by bacteria which live on the surfaces of the teeth as a layer called plaque. When foods or drinks containing sugars enter the mouth, the bacteria within the plaque rapidly convert the sugars into acid.