Oral health-related quality of life impacts are low 27 years after periodontal therapy.

Aim: This pilot study assessed the oral-health-related quality of life (OHRQoL) after long-term periodontal therapy and explored OHRQoL differences along the 2018 Classification of Periodontal Diseases.

Methods: Sixty patients were examined before (T0) and after active periodontal therapy (APT/T1) and 32.0 ± 2.