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A man brushing his teeth while looking in a mirror. Tooth brushing is the act of scrubbing teeth with a toothbrush equipped with toothpaste.Interdental cleaning (with floss or an interdental brush) can be useful with tooth brushing, and together these two activities are the primary means of cleaning teeth, one of the main aspects of oral hygiene. [1]
A Penrose tiling with rhombi exhibiting fivefold symmetry. A Penrose tiling is an example of an aperiodic tiling.Here, a tiling is a covering of the plane by non-overlapping polygons or other shapes, and a tiling is aperiodic if it does not contain arbitrarily large periodic regions or patches.
Ensuring effective brushing is important in getting rid of food and bacteria properly. Step 1) Place a pea-sized amount of toothpaste on the brush and hold at a 45-degree angle. Step 2) In small circular and back and forth motions, move the brush gently along teeth and gums. Step 3) Brush all surfaces inside the mouth, including the tongue.
A tiling that cannot be constructed from a single primitive cell is called nonperiodic. If a given set of tiles allows only nonperiodic tilings, then this set of tiles is called aperiodic. [3] The tilings obtained from an aperiodic set of tiles are often called aperiodic tilings, though strictly speaking it is the tiles themselves that are ...
Teeth whitening strips are easy-to-use, peel-and-stick strips that you wear on your teeth for 15 to 30 minutes each day. "Most kits come with a 30-day supply and are relatively easy to use," says ...
A 1930s poster from the Work Projects Administration promoting oral hygiene. Tooth decay is the most common global disease. [14] Over 80% of cavities occur inside fissures in teeth where brushing cannot reach food left trapped after eating and saliva and fluoride have no access to neutralize acid and remineralize demineralized teeth, unlike easy-to-clean parts of the tooth, where fewer ...
An example is the sphinx tiling, an aperiodic tiling formed by a pentagonal rep-tile. [20] The sphinx may also tile the plane periodically, by fitting two sphinx tiles together to form a parallelogram and then tiling the plane by translation of this parallelogram, [ 20 ] a pattern that can be extended to any non-convex pentagon that has two ...
By iterating this tile substitution, larger and larger regions of the plane are covered with a square grid. A more sophisticated example with two prototiles is shown below, with the two steps of blowing up and dissecting merged into one step. One may intuitively get an idea how this procedure yields a substitution tiling of the entire plane. A ...