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.
Sheldon J. Plankton, better known as Plankton, is the main antagonist of Nickelodeon's popular cartoon series, SpongeBob SquarePants, and the first theatrical film based on the show. He is the owner of the Chum Bucket restaurant who seeks to grow his business by stealing the Krabby Patty formula and eventually take over the world.