The standard dental formula for the primary (deciduous) dentition in humans is 2.1.2/2.1.2. This notation represents the number of each type of tooth present on one side of the upper jaw (maxilla) and lower jaw (mandible).

- The dental formula is a shorthand way to describe the number and arrangement of teeth.
- For primary dentition, the formula 2.1.2/2.1.2 means:
→ 2 incisors
→ 1 canine
→ 2 molars

- There are no premolars in the primary dentition.
- This count is for one half of the jaw; multiply by 2 for the full upper or lower jaw.
- Therefore, children typically have 20 primary teeth in total (5 teeth per quadrant × 4 quadrants).

In contrast, the permanent dentition includes premolars, reflected in the adult dental formula of 2.1.2.3/2.1.2.3.

Key points:
- Primary dentition lacks premolars
- Each quadrant has 5 teeth: 2 incisors, 1 canine, 2 molars
- Total primary teeth count = 20

Reference: Ten Cate's Oral Histology, 9th Edition, Chapter 3, Page 45