Incisors are one of the four main types of teeth. They are located in the front of the mouth and are used for biting and cutting food. Incisors are usually the first teeth to come in (erupt) and the last to fall out (exfoliate). There are eight incisors in total, four on the top and four on the bottom.

Incisors are made up of two parts: the crown and the root. The crown is the part of the tooth that is visible above the gum line, while the root is hidden below the gum line. Incisors have a relatively flat surface and a sharp edge, which helps them cut through food.

The root of an incisor is typically about twice as long as the crown. It is anchored in the jawbone by a small piece of connective tissue called the periodontal ligament. This ligament helps to hold the tooth in place and allows it to move slightly when biting and chewing.

Incisors are typically white in color, although they may yellow or stain over time. They are made up of a hard outer layer of enamel and a softer inner layer of dentin. The root is covered in a thin layer of cementum.

Incisors are important for biting and cutting food, but they can also play an important role in speaking and smiling. Because they are located in the front of the mouth, they are one of the first things people see when they look at someone else’s face.

While most people have eight incisors (four on the top and four on the bottom), it is not uncommon for some to have more or fewer teeth. In fact, it is estimated that around 5% of the population has an extra incisor (supernumerary tooth). These teeth are often smaller than the regular incisors and may be located next to them or in a different part of the mouth.