Introduction. Clinical practice guidelines: nonsurgical and surgical treatments for periodontitis

– Treatment of stage I-III periodontitis by S3-level clinical practice guideline (S3 CPG);

– Step 2: non-surgical treatment:

- Traditional and novel methods for subgingival instrumentation,

- Role of adjunctive therapies (e.g. local and systemic antimicrobials, probiotics, etc.);

– Step 3: surgical treatment:

- Access surgery,

- Resective surgery,

- Regenerative approaches to achieve the goals of periodontal therapy.