Periodontal treatment is the specialist cleaning of your teeth and gums to help control the bacteria that cause gum disease. Gum disease is caused by the germs (bacteria) which live in your mouth. The bacteria stick to your teeth, irritate the gums and make them bleed.
(Redirected from Ground effect in aircraft) In fixed-wing aircraft, ground effect is the increased lift (force) and decreased aerodynamic drag that an aircraft's wings generate when they are close to a fixed surface. When landing, ground effect can give the pilot the feeling that the aircraft is floating.
ground zero (Noun) The point on the land or water surface below, above, or at which an atomic or nuclear bomb detonates. ground zero (Noun) The location of any disaster. Ground Zero (ProperNoun) The site of the former World Trade Center towers in New York City destroyed on 11 September 2001.