(See also Introduction to Periodontal Disease.) Trench mouth is a painful infection of the gums, causing pain, fever, and sometimes fatigue. If the normal bacteria in the mouth overgrow, the gums can become infected. The gums hurt, and people sometimes have extremely bad breath.
The Elements of Art and Design: A continuous mark made on a surface by a moving point; it may be flat (pencil line) or three-dimensional (a rod, groove, ridge, etc.) Line may be explicit - a line painted along the edge of the road - or implied by the edge of a shape or form.
Elements of Art/Design and Principles of Design/Organization. Whole books are written about each of these art terms, filled with definitions, histories, insights, tips, and examples-these pages are just the tip of the iceberg. Each entry leads to its own page with some more information and examples, which should grow over time-feel free to make suggestions.