B is the answer to your question
The answer is B. cold-blooded
'There is some evidence that using mouthwashes does have some clinical benefit in reducing levels of plaque - but only by a bit,' says Professor Damien Walmsley, scientific adviser to the British Dental Association.
They are helpful, they are never going to be a replacement for the mechanical action of a toothbrush for getting teeth and gums clean.'
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