**Question:** Primary Dentition begins to show teeth eruption by __________

**Core Concept:**
The primary dentition, also known as baby teeth, is the first set of teeth that develops in an infant's mouth. These teeth are essential for proper dental development and jawbone growth. Teeth eruption is the process by which teeth break through the gums and become visible.

**Why the Correct Answer is Right:**
The correct answer is **Option B:** **"around 6 months"**. In infants, primary teeth begin to erupt around the age of 6 months, with the first tooth, usually the lower central incisor, appearing around the same time. This process continues until all 20 primary teeth are present by the age of 3 years.

**Why Each Wrong Option is Incorrect:**
**Option A (6 months)**: This is too early for the first tooth eruption, which occurs around 6 months.
**Option C (12 months)**: This is too late for the completion of primary tooth eruption, which is complete by the age of 3 years.
**Option D (not mentioned)**: This option does not accurately describe the timing of primary tooth eruption.

**Clinical Pearl / High-Yield Fact:**
Understanding tooth eruption timing is crucial for assessing dental health and for anticipating when parents should seek medical attention for delayed eruption or other dental concerns in their infants.

**Correct Answer:** **Option B: Around 6 months**.

The eruption of primary teeth begins around 6 months of age and continues until the age of 3 years. This process is essential for proper dental development and ensures the child's ability to grind food effectively and maintain oral hygiene. Adequate care during this period is crucial, as untimely or delayed eruption may indicate a potential dental or systemic issue, requiring medical consultation.