Tooth decay is the result of an infection with certain types of bacteria that use sugars in food to make acids. Over time, these acids can make a cavity in the tooth.
Symptoms are toothache. Feel tenderness or pain when eating or drinking something hot, cold or sweet. Grey, brown or black spots appearing on your teeth. Bad breath.
Over the last several decades, dental researchers have made tremendous progress in defining and learning to thwart the decay process. This work has involved the three-pronged strategy of discovery, innovation, and prevention - and produced one of the major public health success stories of the 20th century.
According to the statistical data in India 500 millions of people facing Cavities/tooth decay problem.