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A patient complains of bad breath but has healthy gums. Where should the student look first? The tongue dorsum - its papillae trap the bacterial coating producing volatile sulfur compounds, the commonest halitosis source. Management: tongue cleaning, hydration, and only then systemic workup for the minority with non-oral causes. Paired lesson: dentinal hypersensitivity's exposed dentin tubules transmit cold/sweet stimuli to the pulp - desensitizing agents block the tubules. Students learn both as quality-of-life dentistry: socially and functionally distressing, simply diagnosed, simply treated.