Which of the Following Is Not True About the Interaction

Which of the following is not true about the interaction of biofilms on teeth?

A) When plaque calcifies into tartar it must be scraped off the teeth.
B) Dentists recommend a twice- yearly dental cleaning and checkup to limit caries and periodontal disease,
C) Bacterial growth within deeper biofilm layers and new bacteria entering the mouth quickly reestablish what was removed from brushing.
D) Limiting dietary fats reduces lactic acid production by the bacteria in dental plaque and decreases the risk for dental caries,
E) Brushing teeth twice daily and flossing will physically remove superficial plaque layers.