Teeth decay.
Meaning: This means that teeth can get damaged or destroyed due to bacteria and plaque buildup. It's like saying, Teeth can rot if not taken care of properly.
Choice of Words: Teeth are the hard, white objects in your mouth used for chewing food. Decay is a verb that means to rot or decompose. When you put them together, "Teeth decay" means that teeth can rot or decompose due to bacteria and plaque buildup.
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