1 In-office bleaching is more expensive than take-home alternatives. 2  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.
Sheldon James Plankton, or simply Plankton, is a character in the Nickelodeon animated television series SpongeBob SquarePants.Although usually an antagonist, he is frequently shown as a protagonist or an antihero. He is voiced by Mr. Lawrence and first appeared in the episode  Plankton!  on July 31, 1999.heldon James Plankton, or simply Plankton, is a character in the Nickelodeon animated television series SpongeBob SquarePants.
The word plankton comes from the Greek meaning drifter, so technically, anything which drifts with the currents of the ocean, is planktonic. Usually, plankton are small, like these tiny copepods, but some plankton are large, like this jellyfish. There are two basic kinds of plankton, phytoplankton and zooplankton.