what are the layers of teeth?
['Crown — the top part of the tooth, and the only part you can normally see. ... ', 'Gumline — where the tooth and the gums meet. ... ', 'Root — the part of the tooth that is embedded in bone. ... ', 'Enamel — the outermost layer of the tooth. ... ', 'Dentin — the layer of the tooth under the enamel.']