Bangkok Post : Realtimewww.bangkokpost.co.th, 5 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