(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.
The principles of design describe the ways that artists use the elements of art in a work of art.  Balance is the distribution of the visual weight of objects, colors, texture, and space. If the design was a scale, these elements should be balanced to make a design feel. stable.