DIRECTIONS: Read the following passage carefully and answer the following questions.
Welcome to the brave new world of hightech dentistry. Here, teeth stained by coffee, tea, and tobacco are bleached considerably white in a single sitting, and crowned and laminated in a single visit. Infected gum tissue can be vaporized bloodlessly in a few minutes with lasers. Even though restorative dentistry dates back to ancient civilizations, it is, in a sense, a new art and one that is increasingly in demand. Indeed, restorative dentistry has become a multibilliondollar industry. More and more people are clamouring for dentistry that not only ensures good oral health but also helps attract admiring glances and raises selfesteem.
If you need a restoration either an inlay that replaces part of a tooth or a crown that covers it entirely, some dentists offer a spaceage ticket called 'Cerec'. This laser scanner outlines and preserves the genetic design of your tooth with precision. It calculates the tooth's exact size and shape, creates a threedimensional computer image and sends it to a milling unit where, in minutes diamond burrs transform a tiny block of ceramic that is coloured to match the enamel of your other tooth into a natural looking crown.