cuspid

A cuspid, also known as a canine tooth or eyetooth, is a type of tooth found in humans and many other mammals. In humans, there are typically four cuspids, located on each side of the jaw, between the incisors and the premolars. These teeth are characterized by their single, pointed cusp, which is a prominent projection on the chewing surface.

The primary function of cuspid teeth is to tear and shear food, due to their sharp, pointed shape. They play a crucial role in the initial breakdown of food during mastication. In some animals, such as canids (dogs and wolves), the cuspids are highly developed and are used for hunting, fighting, and tearing flesh.

In human dentition, the cuspids erupt into the mouth later than the incisors but before the premolars. The upper cuspids usually appear around 11 to 12 years of age, while the lower cuspids typically emerge between 9 and 10 years of age. Like other teeth, cuspids are composed of dentin, enamel, and pulp. They are anchored in the jawbone by a root, which is generally the longest root of any human tooth, providing strong support. Their strategic position and structure make them essential for both biting and chewing.