You can find much more about tooth cleaning techniques in my book: GROWING A HEALTHY CHILD, SECRETS FROM A WISE OLD DOC
While regular professional visits and “cleanings” are very important for a total prevention program, a daily 360 degree cleaning is the most important.
I hope this helps with your problem.
It is also possible you have a frequent source of sugar. This can cause rapid growth of plaque. One frequent source of sugar is sipping on a sugar containing drink over a long time.
This subject is very well explained in the book GROWING A HEALTHY CHILD, SECRETS FROM A WISE OLD DOC.
A third reason would be to prevent movement of teeth near the missing teeth, or the teeth biting against the missing teeth.These teeth can move and cause problems which can lead to loss to one or more of these other teeth.You will need your dental bridge as long as you want to preserve these other teeth.