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 drifting organisms in aquatic environments, including marine and fresh water. They are the base of the food web in these environments. Plankton can be divided into broad functional groups: 1  Phytoplankton are microscopic plants that form the base of the marine food chain.2  Though they are small, the energy they capture from the sun through photosynthesis helps to sustain almost all life in the ocean.oplankton also need iron in their diet. So, that is also where zooplankton can be found; the top 100 meters of the water to be exact. Just like phytoplankton, zooplankton can't swim; instead they just float along with the currents, tides and and winds.