New evidence on fluoridation.

An overview, developed following a world study tour on fluoridation, is presented. Differences in attitudes and practice in various countries are outlined. Some of the possible reasons for these differences are discussed, together with recent evidence which could change the perceived balance of risks and benefit which determine one's judgement on fluoridation. Such a value judgement is essentially a subjective one, influenced but not determined by scientific knowledge. The fluoridation controversy and the case for fluoridation, in the light of this changed balance, is examined.