Palmer explains that dental plaque is a film of bacteria and salivary proteins that forms on the teeth. The bacteria present in the plaque on coming in contact with simple sugars ferments the sugars into acids which in turn destroys enamel. 20 minutes after something sweet is eaten bacteria start fermenting food into acid a process which then lasts for 30 minutes. So, when you drink a sweet drink slowly, sipping it several times, the bacteria get more active time and release more acid. If however you were to drink it all up in a few minutes, the amount of acid released would be much less. She further added, that all simple carbohydrates -- glucose, fructose, maltose, and, to a lesser extent, lactose, and sucrose could be metabolized by these bacteria. Complex carbohydrates, like starches are also capable of being fermented by the bacteria in our mouths, if the starches are kept in the mouths long enough for saliva to break them down into simple sugars.
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