Receding Gums on One Tooth: Differential Factors & Clinical Evaluation

Anatomical tooth position is a recognized predisposing factor in single-tooth recession. In many individuals, specific teeth—especially mandibular central incisors, maxillary canines, and first premolars—are positioned slightly facially (toward the outside of the arch) relative to neighboring teeth.

When a tooth root is prominent within the dental arch, the overlying buccal cortical bone plate can be naturally thin or anatomically absent, a structural condition termed an alveolar dehiscence. In these locations, the marginal gingiva lacks rigid skeletal backing and is supported primarily by soft tissue.

The 2018 World Workshop consensus on periodontal classifications (Jepsen et al., 2018) notes that teeth with thin periodontal phenotypes and underlying bony dehiscences are biologically vulnerable to marginal recession when subjected to mechanical forces or inflammatory challenges. However, root prominence is a predisposing anatomical feature, not a standalone diagnosis.

Another localized factor that clinicians evaluate is tension from an oral frenum—a fold of mucous membrane connecting the lips or cheeks to the alveolar mucosa. The mandibular and maxillary labial frenums are the most frequently examined.

When a frenum attaches unusually close to the gingival margin (often described as a high frenum attachment), routine movements during speaking, chewing, and facial expression can exert dynamic mechanical pull on the marginal tissue. In some individuals, this chronic tension may facilitate separation of the marginal tissue from the tooth surface.

This dynamic pull is often noted on mandibular central incisors, where a prominent lower labial frenum may act as a contributing factor to localized apical tissue movement. Nevertheless, frenum tension alone does not necessarily cause recession; its clinical impact depends on the width of attached keratinized gingiva and overall tissue phenotype.

Localized recession can also reflect site-specific mechanical friction. For instance, right-handed individuals may inadvertently apply heavier horizontal scrubbing force to the left maxillary canine and premolars, where the toothbrush first contacts the arch.

Oral piercings represent another potential source of localized mechanical trauma. Lower lip studs (labrets) or tongue jewelry can repeatedly contact the facial or lingual gingival margin of specific anterior teeth, leading to localized tissue irritation and recession over time.

Foreign object habits—such as habitual pen-chewing, fingernail manipulation against a specific gum margin, or aggressive use of rigid toothpicks—can similarly contribute to localized marginal damage. Clinicians carefully review these habits during examination.

Because localized recession can arise from varied contributors, accurate identification requires a professional clinical evaluation. Clinicians perform periodontal probing around all six surfaces of the affected tooth to measure probing depth and clinical attachment loss.

Under the 2018 classification framework (Tonetti et al., 2018), assessing interdental attachment loss and radiographic bone levels distinguishes isolated mucogingival recession from localized periodontitis. Periodontitis involves inflammatory breakdown of connective tissue attachment and alveolar bone, which presents differently from isolated mechanical recession.

Furthermore, the clinician assesses occlusal contacts during lateral jaw movements to determine whether traumatic occlusal forces are concentrating stress on the tooth. By synthesizing probing depths, radiographic findings, tissue phenotype, and patient habits, the dental team establishes an accurate differential picture.