Complex sentence: A smooth cementum provides less opportunity for bacteria to accumulate and form calculus, so root planing is an important part of stopping progression of periodontal disease, especially once deeper pockets have formed in the gums, which is really in the bone.
Split into simpler sentences: A smooth cementum provides less opportunity for bacteria to accumulate and form calculus. So root planing is an important part of stopping the progression of periodontal disease, especially once deeper pockets have formed in the gums, which is really in the bone.