**Core Concept**
Recontouring and selective grinding procedures in complete denture fabrication are aimed at modifying the occlusal surface to achieve optimal occlusal harmony and stability. This involves adjusting the denture teeth to eliminate any occlusal disharmony, ensuring proper distribution of forces and preventing excessive wear on the denture teeth and underlying tissues.

**Why the Correct Answer is Right**
The primary goal of recontouring and selective grinding is to remove occlusal disharmony, which can lead to discomfort, pain, and poor denture stability. By adjusting the occlusal surface, the dentist can ensure proper occlusal contacts between the denture teeth and the natural teeth or denture teeth, thereby preventing excessive wear and tear on the denture and underlying tissues. This process involves evaluating the occlusal scheme, identifying areas of occlusal disharmony, and making precise adjustments to the denture teeth to achieve optimal occlusal harmony.

**Why Each Wrong Option is Incorrect**
**Option A:** Decreasing the vertical dimension of occlusion is not the primary goal of recontouring and selective grinding. While adjusting the occlusal surface may involve slight changes to the vertical dimension, the primary objective remains the removal of occlusal disharmony.

**Option B:** Decreasing cuspal height is not a primary goal of recontouring and selective grinding. While cuspal height may be adjusted as part of the recontouring process, the primary focus remains on eliminating occlusal disharmony.

**Option C:** Enhancing the curve of Spee is not a primary goal of recontouring and selective grinding. The curve of Spee is a natural anatomical feature that may be influenced by recontouring and selective grinding, but the primary objective remains the removal of occlusal disharmony.

**Clinical Pearl / High-Yield Fact**
A key consideration in recontouring and selective grinding is the importance of maintaining proper occlusal contacts between the denture teeth and the natural teeth or denture teeth. Failure to achieve optimal occlusal harmony can lead to excessive wear on the denture and underlying tissues, resulting in poor denture stability and patient discomfort.

**✓ Correct Answer: D. Remove occlusal disharmony**