Bangkok Post : Realtimewww.bangkokpost.co.th, 4 Jan 2007 [cached]An advocate of xylitol _ a natural sweetener obtained from birch, evergreen oak, strawberries and other plants _ in preventive dentistry, professor emeritus Kauko K Makinen of the Institute of Dentistry, University of Turku in Finland, explained that dental caries are a multifactorial problem and since the 1970s it has been known tha