quitting sugar to stop tooth cavities - affective ?

Hi all.
Conventional dental treament seems to do me very little good - it's
expensive, painful and
it just doesn't seem to succeed in preventing cavities.
I am so sick and frustrated of this situatation I am considering
quitting sugar altogether.
Actually the only thing that is keeping from doing so is that I am not
sure how affective this is -
I am looking for any evidence or research about quitting sugar in this
context, suprisingly it seems that ppl are
only intersted in quitting sugar in order to lose weight....
Any idead and comments are welcome.
Thanx.

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