A periodontist is a dentist who specializes in the prevention, diagnosis, and treatment of periodontal disease, and in the placement of dental implants. Periodontists are also experts in the treatment of oral inflammation.
Ground speed. Ground speed is the horizontal speed of an aircraft relative to the ground. An aircraft heading vertically would have a ground speed of zero. Information displayed to passengers through the entertainment system often gives the aircraft ground speed rather than airspeed.
Tips Edit. 1  It is a good idea to turn Fast Forward off if you are trying to place Road Spikes during a level. 2  Towers attack slightly faster compared to bloon speed when Fast Forward is off. 3  Spamming abilities (e.g. Ground Zero) should generally be done if Fast Forward is off. It is a good idea to turn Fast Forward off if you are trying to place Road Spikes during a level. 2  Towers attack slightly faster compared to bloon speed when Fast Forward is off. 3  Spamming abilities (e.g. Ground Zero) should generally be done if Fast Forward is off.