In the sentence "There is 0 mm of attached gingiva," is the proper word "is" or "are" when asking about the millimeters?
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It's plural: "How many millimeters?", and this is even if the number is 0.
There was a similar question but I couldn't find it, where the question was about numbers below 0.
There is 1 millimetre and there are 0 or more millimetres
1 is singular