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.
Plankton are at the mercy of the wind and the waves, but not all are completely immobile. Some types of plankton can swim, but they swim only weakly or vertically in the water column. And not all plankton are tiny-jellyfish (sea jellies) are considered plankton.lankton is the term that generally refers to the floaters, the organisms in the ocean that drift with the currents.