[MargaretR]

Some dental procedures damage health.
Mercury amalgam fillings cause a slow gradual build up of that toxic metal in your body and cause health problems in later life.
Fluoride in water and toothpaste is also toxic.
The way to lessen all such problems is to cut down on sugar intake.
Even that will not be enough to guarantee that your teeth will last as long as you do.
So whether you have fillings or suffer bad teeth - you lose them eventually.
As you age, gums shrink (the expression 'long in the tooth'), so even good teeth wobble and need replacing with dentures in order to continue eating normally.
So by all means try to preserve them as long as you can, but be wary of hazardous dental procedures, and weigh up what is best for you, because some people have inherited genetically wonderful teeth - lucky 'persons'