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.
Dry fast There are two kinds of dry fasts: hard and soft. With a hard dry fast, the faster does not allow any water to touch their body, i.e. no washing dishes, no taking baths or shower, no brushing teeth, etc. With a softer dry fast, the faster can allow their body to come in contact with water. When you go on a dry fast, the pours of your skin develop a greater capacity to absorb water through the skin and in a good clean environment will readily absorb moisture from the air. Dry fasting should NOT be carried out hastily, or if you are a beginner.