What is the fifth principle of minimal intervention?

• A. Remineralization
• B. Early diagnosis
• C. Reduction in cariogenic bacteria
• D. Repairing rather than replacing defective restorations

Answer: (D)

In minimal intervention dentistry, the guiding approach is to preserve tooth structure and manage problems with the least invasive means. When a restoration is defective, the preferred action is to repair it rather than replace. Repairing restores function and seals defects while conserving healthy tooth structure, reduces additional tooth prep, and can be durable if done properly. Replacement is reserved for cases where a repair cannot achieve a reliable, long-lasting result. While remineralization, early diagnosis, and reducing cariogenic bacteria are important parts of caries care, they are not the approach described by this principle.