Tested on Gulf Medical Boards (DHA, SMLE, MOH & HAAD)
Clinical calculations and diagnostic scoring systems like Simplified Oral Hygiene Index (OHI-S - Greene & Vermillion) frequently appear on Prometric exams. Master high-yield clinical vignettes with instant AI-powered pathophysiology rationales.
What is the Simplified Oral Hygiene Index (OHI-S - Greene & Vermillion)?
The Simplified Oral Hygiene Index (OHI-S - Greene & Vermillion) is an evidence-based clinical decision rule engineered to quantify diagnostic probability, stratify clinical severity, and guide therapeutic decision-making in dentistry practice. Implements the Greene and Vermillion Simplified Oral Hygiene Index (OHI-S) assessing plaque/debris and supragingival/subgingival calculus on 6 standard index tooth surfaces to objectively grade clinical oral hygiene and periodontal maintenance efficacy. Clinical scoring tools like Simplified Oral Hygiene Index (OHI-S - Greene & Vermillion) are essential in acute and outpatient management, enabling clinicians to objectively differentiate between low-risk candidates suitable for conservative therapy and high-risk patients requiring urgent interventions. Verified against current 2026 clinical standards, this tool is extensively tested on Gulf health authority licensing exams including DHA (Dubai), SMLE (Saudi Arabia), MOH, HAAD/DOH (Abu Dhabi), OMSB (Oman), and QCHP (Qatar).
💡Clinical Pearls & Diagnostic Utility
Provides standardized, quantitative epidemiological and clinical tracking of dental plaque accumulation and calculus mineralization across dental hygiene regimens.
Formula & Calculation Parameters
The mathematical equation and clinical variables required to calculate Simplified Oral Hygiene Index (OHI-S - Greene & Vermillion):
Score Interpretation & Clinical Stratification
| Score Range | Clinical Interpretation | Risk Tier |
|---|---|---|
| ≤ 1.2 | Good Oral Hygiene (OHI-S 0.0 - 1.2) | green |
| 1.3 – 3 | Fair Oral Hygiene (OHI-S 1.3 - 3.0) | yellow |
| ≥ 3.1 | Poor Oral Hygiene (OHI-S 3.1 - 6.0) | red |
When to Exercise Caution
Evaluates 6 designated index teeth; if index teeth are missing, alternate adjacent teeth must be substituted.
Clinical Review Board
Dr. Muhammad Nouman, MBBS
Capital Medical University | PMDC Reg No: 117744-P
Clinical Audit Status
✓ Verified for 2026 Guidelines
Last updated: 2026-08-08
Peer-Reviewed Medical Literature
- •Greene JC, Vermillion JR. The Simplified Oral Hygiene Index. J Am Dent Assoc. 1964;68(1):7-13.
- •World Health Organization. Oral health surveys: basic methods. 5th ed. Geneva: WHO; 2013.
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