The extent of dental caries incidence has reached such proportions that it may no longer be kept under control by restorative methods alone. Parodontopathy is besides tooth caried the most wide spread ailment. Bacterial plaque can be considered as main cause and key-factor for caries incidence and parodontopathy. All other causes are co-factors. It follows that decrease of dental plaque must be the most urgent goal in prophylactic dentistry. The combination of all caries and parodontal prophylactic remedies and methods determines as a complex the fate of hard and soft tissues exposed to bacterial plaque.