1 Its cost, on average, is $650, compared to $400 for take-home trays and under $100 for over-the-counter bleaching trays or whitening strips. 2  Results can be unpredictable, depending on factors such as age, heredity and the type of staining that is present.
Plankton (singular plankter) are a diverse group of organisms that live in the water column of large bodies of water and that cannot swim against a current. They provide a crucial source of food to many large aquatic organisms, such as fish and whales.
1 Microscopic: too small to be seen with an unaided eye. 2  Millimeter: a unit of length that is one thousandth the size of a meter, and one tenth size of a centimeter. 3  Plankton: a group of free floating organisms living in water that includes many kinds of plants and animals...iants of the Plankton World. There are also giants in the plankton world called macroplankton and megaplankton. Krill and jellyfish are examples of plankton big enough to see without a microscope.