**Core Concept**
The cingula are small, ridge-like structures located on the mesial surfaces of the mandibular molars and premolars. The cingula are part of the periodontal anatomy and play a crucial role in the attachment of the periodontal ligament to the tooth surface.

**Why the Correct Answer is Right**
The cingula are formed by the presence of a small, rounded elevation on the mesial surface of the tooth. This elevation is a result of the shape of the tooth and the surrounding bone. The cingula are an important landmark for periodontal surgery and are often used as a reference point for the placement of dental restorations. The presence of the cingula can also affect the way the tooth erupts and the way the periodontal ligament attaches to the tooth surface.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the number of cingula in each dentition.
**Option B:** This option is incorrect because it is referring to a different dental structure.
**Option C:** This option is incorrect because it is not related to the number of cingula.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the cingula are a normal anatomical feature and should not be confused with abnormal or pathological conditions such as periodontal disease.

**Correct Answer:** C. 8. Each dentition contains 8 cingula.