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Necrotizing periodontal disease (NPD) is an uncommon but destructive inflammatory condition that requires prompt recognition and appropriate management. For dental hygienists and dentists, knowing the hallmark signs can help guide clinical assessment, timely intervention, and referral when needed. What Is Necrotizing Periodontal Disease? NPD is characterized by three hallmark findings: Interdental tissue necrosis Intense gingival pain Spontaneous gingival bleeding Other findi