A year
Every time the Earth revolves around the sun, a year has passed
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So far from 2019 there are about 21.67 million of our population just in floirda.
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If the enamel or cementum gets worn down or if the gum line has receded, then the dentin becomes exposed. "Cavities, cracked teeth, gum recession, enamel and root erosion all cause dentin to be exposed," Culotta-Norton said. "Dentin is connected to the nerve that triggers pain in sensitive teeth."
Biome is a major regional and global community of organisms.