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.
These are planktons-tiny organisms that drift along the surface of fresh water. The word plankton originates from the Greek word that means a drifter or a wanderer. There are basically two categories of plankton. Though they are similar in size and ecological importance, there is a world of difference between them.1  Basic difference. 2  The most obvious difference between them is that zooplankton is an animal while phytoplankton is actually a plant. 3  Diatoms and algae are two forms of phytoplankton that are commonly seen.hese are planktons-tiny organisms that drift along the surface of fresh water. The word plankton originates from the Greek word that means a drifter or a wanderer. There are basically two categories of plankton. Though they are similar in size and ecological importance, there is a world of difference between them.