Periodontal Disease -

: Plaque (a sticky film of bacteria) builds up on the teeth. If not removed, it hardens into calculus (tartar).

The development of periodontal disease relies on a complex interplay between bacteria and your body's immune system. periodontal disease

Periodontal disease generally progresses through two main clinical stages: Periodontal Disease - StatPearls - NCBI Bookshelf - NIH : Plaque (a sticky film of bacteria) builds up on the teeth