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.
Described as both a âVertical Cityâ and âA Living Wonder,â Burj Khalifa, developed by Dubai-based Emaar Properties PJSC, is the worldâs tallest building. Rising gracefully from the desert, Burj Khalifa honors the city with its extraordinary union of art, engineering and meticulous craftsmanship. At 828 meters (2,716.5 ft), the 200-storey Burj Khalifa has over 160 habitable stories, the most of any building in the world. The tower was inaugurated on January 4, 2010, to coincide with the fourth anniversary of the Accession Day of His Highness Sheikh Mohammed Bin Rashid Al Maktoum as the Ruler of Dubai.