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The term that accurately describes the reddish-brown color associated with canines is chroma. Chroma refers to the intensity or purity of a color, indicating how vivid or dull the color appears. In this context, when referring to the dental color of canines, chroma specifically relates to the saturated color characteristic that canines exhibit, which often appears reddish-brown due to the underlying dentin and enamel properties.

Hue refers to the actual color itself (like red, blue, green) but does not capture the intensity or richness of the color. Shade refers to a variation of a color, often influenced by light and surroundings, rather than the intrinsic color property you might see in canines. Stain implies a discoloration or mark, generally used to describe a surface change rather than the inherent color of a tooth.

Thus, chroma is the most appropriate term in this context as it captures the specific quality of the color associated with canines, emphasizing their distinctive reddish-brown appearance.