Palato-radicular groove is a discreet alteration in tooth morphology, characterized by an invagination that begins near the cingulum of the tooth and moves in an apical direction. Clinically, palatoradicular groove may be associated with periodontal and/or endodontic problems. This paper describes a clinical case of a young patient with palatoradicular groove in the maxillary right lateral incisor with signs of periodontitis but no endodontic impairment. An early diagnosis was made, and treatment consisted of surgical sealing of the defect. After a six-month period, re-examinations demonstrated adequate hygiene, maintenance of tooth vitality, and periodontal health. The early diagnosis and surgical sealing of the groove made the root surface smooth, avoiding subgingival bacterial plaque buildup, and preventing possible periodontal and/or pulp impairment stemming from the defect.