Sugar plays a harmful role in tooth decay. The bacteria that form together to become plaque use sugar as a form of energy.
They multiply faster and the plaque grows in size and thickness. Some of the bacteria turn the sugar into a kind of glue that they use to stick themselves to the tooth surface.
This makes it harder for the bacteria to get washed away with your saliva.
Next: How does Plaque cause a cavity?
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What Causes Cavity?
Why does it take so long to hurt?
What is Root Canal Therapy?