The aim of this paper was to describe what experts of today believe ar
e the main reasons explaining the caries decline seen in many westerni
zed countries over the past 3 decades. We have collected the views of
a number of international experts, trying to answer the specific quest
ion ''What are the main reasons why 20-25-year-old persons have less c
aries nowadays, compared to 30 years ago?''. A questionnaire was maile
d to 55 experts with a number of thinkable explanations to be scored a
ccording to a predetermined scale. The 25 items were divided into main
groups under the heading of diet, fluorides, plaque, saliva, dentist/
dental materials and other factors. The experts were asked to think of
a specific country or area, and also to specify whether the chosen ar
ea had water fluoridation or not. The main finding of our study, based
on a 95% response rate, was that there is a very large variation in h
ow the experts graded the impact of various possible factors. For the
use of fluoride toothpaste, there was a clear agreement of a definite
positive effect.