There are three different forms of digestible carbohydrate: 1) monosaccharides (one sugar molecule—glucose or fructose or galactose; high-fructose corn syrup is an example of two monosaccharides at once); 2) disaccharides (two sugar molecules bound together; maltose (e.g., beer) is glucose-glucose, sucrose (e.g., fruit) is glucose-fructose, and lactose (e.g., milk) is glucose-galactose); and 3) starch, which is a string of glucose molecules polymerized together. But only the first two, monosaccharides and disaccharides, can cause dental caries. The reason is that the oral bacteria can only
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