Dental calculus accumulation is traditionally attributed to inadequate oral hygiene; however, oral function may also influence its formation. This case report describes a patient who presented with a sudden increase in calculus formation on the lingual surface of mandibular anterior teeth, despite no changes in oral hygiene habits. Clinical assessment revealed lip incompetence and signs suggestive of mouth breathing following prolonged mask use. A functional oral intervention, focusing on tongue mobility, bilateral mastication, and lip competence, was implemented without modifying brushing instructions. After six months, calculus deposition significantly decreased, returning to a minimal granular pattern, and improvements in lip competence and facial appearance were observed. This case suggests that oral function may influence patterns of dental calculus formation.
Tomomi Ueda (2026) studied this question.