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The tooth #30 has severe gingival recession: the mesial, distobucca and distolingual (DL) roots having been exposed, especially the last one (Fig.3 lingual view). K: keratinized gingiva lingually, which is much wider than the buccal one (Fig.1).
Xin Wei, DDS, PhD, MS 1st edition 08/20/2015, last revision 08/22/2015