**Core Concept**
Secondary prevention in dentistry refers to the early detection and intervention of oral diseases to halt their progression and prevent complications. This approach focuses on identifying and treating conditions before they become severe, thereby reducing the risk of further damage or disease progression.

**Why the Correct Answer is Right**
Secondary prevention involves the use of diagnostic tests and screenings to detect oral diseases at an early stage. For instance, regular dental check-ups and radiographs (X-rays) can help identify cavities, gum disease, or other oral pathologies before they cause significant harm. Early detection allows for prompt treatment, which can prevent the disease from progressing and reduce the risk of complications such as tooth loss or spreading infection. Dental professionals use various tools and techniques, including periodontal probing and visual examination, to identify potential issues and implement preventive measures.

**Why Each Wrong Option is Incorrect**
**Option A:** Primordial prevention is a broader concept that aims to eliminate the risk factors that contribute to the development of oral diseases. While primordial prevention is essential, it is not the same as secondary prevention, which focuses on early detection and intervention.

**Option B:** Primary prevention in dentistry involves measures to prevent the occurrence of oral diseases in the first place. This can include good oral hygiene practices, a balanced diet, and regular dental check-ups. However, primary prevention is distinct from secondary prevention, which focuses on detecting and treating diseases that have already begun to develop.

**Option D:** Tertiary prevention in dentistry is aimed at managing and treating oral diseases that have already caused significant harm. This can include procedures such as root canals, extractions, or restorative treatments. While tertiary prevention is essential for managing advanced oral diseases, it is not the same as secondary prevention, which focuses on early detection and intervention.

**Clinical Pearl / High-Yield Fact**
It is essential for dental professionals to adopt a prevention-oriented approach, combining primary, secondary, and tertiary prevention strategies to provide comprehensive care and prevent oral diseases from progressing.

**✓ Correct Answer: C. Secondary prevention**