What indicates that probing attachment level is healthy in gingivitis?

In the context of gingivitis, healthy probing attachment levels are typically indicated by probing depths that are less than 3 mm, as well as probing depths that are equal to 0 mm. Healthy gingival tissue should have minimal attachment loss, and probing depths of less than 3 mm generally suggest that the periodontal tissue is not undergoing significant inflammatory changes or damage.

When probing depths are at 0 mm, this indicates an absence of periodontal attachment loss, meaning the gingiva is firm and adherent to the tooth structure without any signs of swelling or bleeding upon probing. Probing depths under 3 mm further illustrate that the tissue is healthy and there is no pocketing or significant periodontal destruction.

Thus, both conditions—probing depth equal to 0 mm and probing depths less than 3 mm—indicate optimal periodontal health, whereas deeper probing depths can suggest the presence of periodontal disease or progression beyond gingivitis. Therefore, the combination of these two criteria accurately reflects a healthy status in the context of gingivitis.