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Gums overgrow in a patient on anti-seizure medication, while another patient has exposed roots from hard brushing. What unites these cases? Both are gingival position disorders with identifiable causes - drug-stimulated fibroblast growth in one, mechanical trauma in the other. Students learn the paired lesson: enlargement adds tissue (remove the cause, reshape surgically if needed), recession loses it (grafting can cover roots) - and both are preventable when the cause is caught early.