Generally people have a 2-3 mm pocket and has little plaque or bleeding. If a person has 4-6 mm pockets, then those are the areas that a deep cleaning will benefit. Bacteria builds up and stay deep in those pockets and continue to cause damage. It is critical that those areas are periodically "disrupted" and the bacteria removed.
Here is a site you can read a bit more on this too. Click here.
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