In order to practice, all orthodontists must be licensed by their state. To receive a dental license, candidates must graduate from an accredited dental school, successfully complete the written National Board Dental Examinations and pass state clinical tests.
The world's tallest artificial structure is the 829.8 m (2,722 ft) tall Burj Khalifa in Dubai . The building gained the official title of Tallest Building in the World and the tallest self supported structure at its opening on January 9, 2010. The second tallest self-supporting structure and the tallest tower is the Tokyo Skytree. The tallest guyed structure is the KVLY-TV mast.
burj khalifa is the worldâs tallest building.there are 163 floors located above the ground of burj khalifa. itâs initial name was burj dubai.it is located in dubai,united arab emirates. Itâs building has a specially designed elevator system for controlled evacuation in times of emergency situations like security threats or fire.