Final answer:
An incisor is a single-rooted tooth in the front of the mouth that is designed to cut. There are eight incisors in total, four on the top and four on the bottom.
Step-by-step explanation:
A single-rooted tooth in the front of the mouth that is designed to cut is called an incisor. Incisors are blade-like teeth and there are eight of them in total, four on the top and four on the bottom. They are used to slice off pieces of food.