It consists of 95% inorganic substance (mainly calcium and phosphate in the form of hydroxyapatite), 1% organic substance, and 4% water. Tooth enamel is the most resistant and hardest tissue in the human body. Also, it protects the tooth against external damaging forces. The enamel is the outer layer of teeth that covers the crown. However, they have the same tooth anatomy. Premolars and molars crush and grind food to make swallowing and digestion easier. Canines allow you to tear and grasp food. Types of teeth and their functions: Incisors cut food. They crush food between the occlusal surfaces of upper and lower premolars and molars to make food swallowing and digestion easier. They have a wide and flat surface (occlusal surface) with several cusps.
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