Deciduous teeth first teeth seen in the mouth are the mandibular centrals and the last are the maxillary second molars. The primary teeth are made up of central incisors, lateral incisors, canines, first molars, and secondary molars; there is one in each quadrant, making a total of four of each tooth. All of these are gradually replaced with a permanent counterpart except for the primary first and second molars; they are replaced by premolars. The replacement of primary teeth begins around age six, when the permanent teeth start to appear in the mouth, resulting in mixed dentition. The erupting permanent teeth cause
Northern dry deciduous forests Northern dry deciduous forests The Northern dry deciduous forests is a tropical dry broadleaf forest ecoregion of east-central India. It covers an area of , extending across portions of Andhra Pradesh, Chhattisgarh, Orissa, and Jharkhand states. The region extends north and south in the dry western rain shadow of the Eastern Ghats range, which block the moisture-laden monsoon winds from the Bay of Bengal to the east. It is surrounded by the more humid Eastern Highlands moist deciduous forests ecoregion. By the mid-1990s, more than three-quarters of the ecoregion's natural habitat had been cleared or degraded. Four protected areas encompass