Oral Glossary Apex - the ending of the tooth root Bicuspids - teeth between the canine teeth and molars Cusp - a pointed ridge located on the chewing of biting surface of tooth Cuspid - The third tooth from the center of the mouth. Also known as a canine tooth Dentin - a mid part of tooth surrounding the pulp and covered by enamel Enamel - the hard white outer covering of the tooth. Enamel is the hardest substance in the body. Gingiva - this is soft tissue that covers the jawbone; Also known as gum tissue. Molars - back teeth used for grinding food Pulp - soft, spongy tissue in the center of the tooth containing blood vessels and nerves Root - the tooth structure that connects the tooth to the jaw Root canal - the space in the root of tooth that contains pulp tissue