What is 'reactive oxygen species' involvement in periodontal disease?
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A
Excessive ROS production by neutrophils during bacterial challenge damages host tissues (collagen, lipids, DNA), contributing to periodontal tissue destruction
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B
ROS are beneficial antioxidants produced by the host
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C
ROS only cause systemic disease, not periodontal destruction
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D
ROS are produced by periodontal bacteria to destroy host defences