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.
Karen Plankton is the main computer system of Sheldon Plankton's laboratory, as well as his sidekick, best friend, and wife. She usually comes up with plans to steal the Krabby Patty secret formula, which Plankton tends to claim as his own ideas. Karen was introduced in the episode Plankton! along with her husband.