The typical probing depth for healthy gingival sulcus is:

• A. 2-3 mm
• B. 3-5 mm
• C. 1-2 mm
• D. 5-7 mm

Answer: (A)

The typical probing depth for a healthy gingival sulcus is indeed considered to be in the range of 2-3 mm. This measurement indicates a normal, healthy state of the periodontium, where the tissues are attached firmly to the tooth without the presence of inflammation or periodontal disease.

When probing is performed using a periodontal probe, a reading of 1-2 mm may indicate very shallow sulci, often seen in very youthful and healthy gum tissues, but doesn't reflect the general consensus for a healthy depth in adult patients. Depths of 3-5 mm can indicate potential gingival issues or the onset of periodontal disease, while probing depths of 5-7 mm and beyond suggest significant periodontal problems, including attachment loss and pocket formation. Therefore, the 2-3 mm range aligns with the clinical standard for a healthy gingival sulcus.