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First molar - upper teeth
The first and second resemble each other so closely that one description will serve for the two. The grinding surface is quadrilateral, with rounded angles. It has four cusps, two buccal and two lingual. Of these, the anterior lingual is the largest, and is connected with the posterior buccal by an oblique ridge of enamel. The groove separating the buccal and lingual cusps extends on to the sides of the crown and is lost near the neck. The median and distal borders usually present a slight ridge. The roots are three in number, two on the labial, and one on the palatine aspect; this last is usually referred to as the palatine root, and often diverges from the crown at a considerable angle.