Which of the following terms describes periodontal disease that was previously treated, but did not respond favorably?

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"Refractory" describes periodontal disease that was previously treated, but did not respond favorably. "Recurrent" describes periodontal disease that has returned after successful treatment, "Aggressive" describes a rapidly progressing form of periodontal disease, "Chronic" describes a long-standing, persistent form of periodontal disease, and "Acute" describes a sudden, severe form of periodontal disease.

Which of the Following Terms Describes Periodontal Disease That Was