Periodontal pockets are a very important indicator in periodontal examinations. A periodontal pocket is a lack of fit and increased depth of the gums and teeth due to bone loss between the gums and teeth. A sharp probe can be inserted painlessly. Normal gums do not have periodontal pockets, so if you probe in from the edge of the gum you will not be able to get in. However, in patients with periodontitis, the gums and roots are stripped away because the inflammation has destroyed the gingival attachment. So a pocket-like structure is formed in the middle of the gums and roots, and as periodontitis worsens, the pocket gets heavier. It is an important indicator when it comes to treatment. If the depth of the periodontal pocket is less than 3mm, it can be treated by scaling or after multiple scaling, i.e. multiple scaling methods. If the depth of the periodontal pocket is more than 3 mm, periodontal treatment is required by scaling in addition to scaling. Periodontal pockets are not visible from the mouth itself because they are the part of the tooth covered by the gums. Therefore, patients are not advised to explore the presence of periodontal pockets at home by themselves. Periodontal pockets have to be checked by a specialist periodontist in a specialist hospital with special tools.