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Tooth is basically a hereditary unit that is in dynamic interplay with its environment, both affecting and being affected by its adjacent or surrounding tissues and organs. These surroundings, which are also by and large genetically determined, exert influence on the behaviour of tooth movement at all developmental stages, and are termed epigenetic factors. It is difficult, therefore, to make a clear-cut demarcation or draw a line of separation between the effects of environment and heredity. Both these factors act simultaneously and bring out a hybridized effect on their subject, the point...