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.
At the base of the aquatic food web are: 1  Plankton. Plankton are microscopic plants and animals whose movements are largely dependent upon currents. 2  Phytoplankton. Plant plankton are called phytoplankton and may be single cells or colonies. 3  Zooplankton. Animal plankton are called zooplankton.