What is the recommended probing force?

• A. Approximately 5 grams of pressure (0.05 N).
• B. Approximately 60 grams of pressure (0.6 N).
• C. Approximately 20 grams of pressure (0.2 N).
• D. Approximately 200 grams of pressure (2 N).

Answer: (C)

Probing depth readings rely on a light, controlled touch so the tissue isn’t compressed and the probe can reach the true base of the pocket. The standard probing force is about 0.2 Newtons, which is roughly 20 grams of pressure. This amount is enough to overcome tissue resistance without distorting the depth or causing tissue trauma, giving consistent measurements over time.

If the force is too light (around 5 grams), the probe may not reach the bottom reliably because tissue resistance can mask the true depth. If the force is too heavy (60 grams or more, up to 200 grams), the tissue is compressed and readings become artificially deep, plus there’s a risk of trauma or bleeding. So the best, most reliable choice is approximately 20 grams of pressure.