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.
This Character Biography topic is currently locked. Sheldon J. Plankton is a one-eyed, two antennaed plankton and is SpongeBob SquarePants' arch nemesis. He owns the Chum Bucket restaurant, a rival of Mr. Krabs' Krusty Krab, where SpongeBob works. The Chum Bucket has never been successful, in part because it serves food with chum as an ingredient.