Many times while at the dentist, you'll hear the term pocketing,
or periodontal pockets. This is the area between the tooth and gums
that forms a small, measurable space called a pocket. Generally,
pocket depths of 1-3mm are considered within normal limits. If these
pockets become deeper, they are then unable to be cleaned properly
by a toothbrush or floss. This will allow the bacteria that normally
inhabit the area to proliferate or grow and continue to break down
the periodontal ligament, causing the pocketing to snowball and worsen.