Periodontal disease is diagnosed during a periodontal examination. This type of exam should always be part of your regular dental check-up.
A periodontal probe is gently used to measure the space between the tooth and the gums. The depth of a healthy sulcus measures 3 mm or less and does not bleed. The periodontal probe helps indicate if pockets are deeper than 3 mm. As periodontal disease progresses, the pockets usually get deeper.