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.
Plankton are a large group of various organisms that drift in waters and are eaten by larger organisms. They consists of very small animals, algae, bacteria and protists. As a group they contain both animals and plants (algae).1 person found this useful.aking the world better, one answer at a time. Plankton is considered an animal, not a plant. it EATS plants, but is not one itself and also uses sunlight (photosynthesis).