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.
Popularity: 92nd All Time, 32nd This Week. Plankton is the owner of the Chum Bucket. Bitter that he gets no business, he has a rivalry with Mr. Krabs and wants to steal the Krabby Patty secret formula. His wife is Karen, a computer.