IHO-S higiene oral
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The IHO-S (Simplified Oral Hygiene Index) calculator is a tool used to assess oral hygiene based on the presence of bacterial plaque and calculus. It calculates the average number of teeth with plaque (BPC) and calculus (BCC) relative to the total teeth, providing a score reflecting oral hygiene quality.
The formula used is (BPC + BCC) divided by the total number of evaluated teeth. Higher values indicate greater plaque and calculus accumulation, suggesting the need for improved hygiene or professional intervention. Clinical exams are typically used to collect the required data.
This calculator is useful in dental clinics to monitor treatment effectiveness or guide patients on daily care. Precautions include checking for loose teeth, using standardized methods for data collection, and contextual interpretation of results.
Frequently asked questions
How are data collected for the IHO-S calculation?
Data is collected through clinical exams, counting teeth with visible plaque and calculus. It is recommended to use proper lighting and dental instruments for accuracy.
What does the score generated by the calculator mean?
The score ranges from 0 to 1, where values closer to 1 indicate higher plaque and calculus accumulation, suggesting the need for stricter hygiene practices.
Who is the IHO-S calculator recommended for?
The IHO-S is recommended for dentists and patients wanting to monitor oral health, especially during periodic assessments or post-treatment follow-ups.
What are the limitations of using this calculator?
The method does not account for subjective factors, such as systemic disease history, and may require adjustments in cases of missing teeth or access difficulties.