Hello, as per your query plaque formation usually occurs every 2 hr after brushing. It us considered helpful for teeth as it prevents friction btw teeth, helps good bacteria to adhere to the teeth preventing the accumutaion of bad bacteria. But if left unremoved for 3 days can lead to calculus
formation which can lead to bad smell, gingivitis
and ultimately loss of teeth occurs due to subsequent bone loss and gum recession. Brushing twice a day is recommended with proper brushing technique. Scaling/ cleaning of teeth is not harmful as it keeps the gums and teeth healthy.