Diagnosis of gingivitis is primarily based on clinical examination. Dentists look for signs such as redness, swelling, and bleeding of the gums. Additionally, they may use a periodontal probe to measure the depth of the gingival sulcus. A sulcus depth greater than 3 mm may indicate the presence of gingivitis. In some cases, histological examination of a biopsy sample may be conducted to confirm the diagnosis.
