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Best Answer: The vertical groove between your upper lip and nose is known as the 'philtrum'. It allows for a greater range of lip motions than would otherwise be possible. http://en.wikipedia.org/wiki/Philtrum.
A Dr. Jonathan B. Levine, DMD , Dentist, answered. Between each tooth is a little space that extends ever-so-slightly up within the gum line between the tooth and the bone. It's called a gingival sulcus. This little space size should measure somewhere between one and three millimeters deep. Sometimes, usually due to poor dental cleaning, a sulcus can become larger or deeper, like five or six millimeters deep. When that happens, it then becomes what's called a pocket.