What are common signs of gingivitis?

Common signs of gingivitis include redness, swelling, and occasional bleeding of the gums. Gingivitis is an inflammation of the gingival tissues, often caused by the accumulation of plaque—a sticky film of bacteria—on the teeth. This inflammatory response leads to the characteristic features observed in the gums. The redness indicates increased blood flow due to inflammation, while swelling suggests the tissue is responding to irritants. Occasional bleeding, particularly when brushing or flossing, is a classic warning sign that the gums are not healthy and that plaque has built up to a point where the body's immune response is activated.

The other signs listed in the choices reflect different conditions. For example, firm, pink gums indicate healthy gingival tissue, while dull pain and sensitivity may point towards early dental disease or pulpitis. Pockets forming between teeth are more indicative of periodontitis, a more advanced stage of gum disease than gingivitis. Thus, redness, swelling, and occasional bleeding are distinctive features of gingivitis, making this the correct choice.