 [ Symptoms ] my heart rate often goes as high as 170 beats per minute when i exercise i am in my mid 60s should i worry about this i monitor my blood saturation and it sometimes drops into the low 90s i have been doing this same kind of workout squash for 18 years [ Disease ] yes you can but the preferred timing is every 3 6 months based on your dentist is recommendation you may think that you are removing all of your dental plaque but you cannot see below the gum line in the deep dark spaces that allow the bad bacteria to grow and proliferate these are the bad bacteria that eat away bone and cause the premature loss of teeth research has shown that the “bad bacteria” which can eat bone recolonize at about 90 days after a professional cleaning