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Two examples of grade 3 furcation exposure. The periodontal probe passes all the way through the furcation, demonstrating marked periodontal attachment loss. (a) Note that the furcation in this tooth (409) is positioned beneath the distal cusp, unlike other two-rooted teeth, where the furcation is under the main cusp of the crown. (b) The probe passes easily between the mesial roots and distal root of the left maxillary fourth premolar (208)
