Silness-Loe Plaque Index
Silness-Loe Plaque Index (Silness & Loe 1964): index of plaque thickness at the gingival margin.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Surfaces scored 0
- 20
- Surfaces scored 1
- 40
- Surfaces scored 2
- 30
- Surfaces scored 3
- 10
Result: Plaque Index 1.3 — fair oral hygiene.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Per surface
- 0 no plaque, 1 film (only after disclosing/probing), 2 moderate visible deposits, 3 abundant soft matter. Index = mean of surface scores.
- Bands
- advisory: 0 excellent, 0.1-0.9 good, 1.0-1.9 fair, 2.0-3.0 poor oral hygiene.
What you enter
- Surfaces scored 0 (no plaque)
- Surfaces scored 1 (film)
- Surfaces scored 2 (moderate)
- Surfaces scored 3 (abundant)
How this is calculated
Silness J, Loe H. Periodontal disease in pregnancy. II. Correlation between oral hygiene and periodontal condition. Acta Odontol Scand. 1964;22:121-135. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.