The Committee on the Status of Endangered Species, a federal advisory group, has created a list of 340 animals and plants that are in some jeopardy. Here are the categories the committee uses: Extinct  The species no longer exists in Canada.
The front teeth are called incisors, You have four incisors on the top jaw and bottom jaw. the central incisors (the front two teeth) the lateral incisors (the teeth on either side of the central incisors) they have multiple functions. your smile, having a full set of teeth will give you an even smilwe.
The different parts of a tooth are: the crown, which is the part you can see above the gum line; the neck, where the crown meets the root; the root, which is the part that extends into the jawbone; the enamel, which is the shell that covers the visible part of the tooth; the cementum, which covers the roots