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.
There are three main types of plankton: 1  Plant plankton, also known as phytoplankton â single-celled photosynthetic organisms which manufacture food using energy from sunlight. 2  Zooplankton â single-and many-celled animals that feed on live plankton. Plant plankton, also known as phytoplankton â single-celled photosynthetic organisms which manufacture food using energy from sunlight. 2  Zooplankton â single-and many-celled animals that feed on live plankton.