If we take uncountable noun (or "mass noun") such as toothpaste which is marked in the dictionary as uncountable, then which auxiliary verb / copular (is / are) I have to use in the following sentences / contexts?
Sentence A: There is/ are toothpaste that is / are not safety. (I mean to one only...)
Sentence B: This toothpaste is pleasant for mouth (I mean to 2 types of toothpaste).
In sentence B my paradox here comes from the fact that it is something uncountable (a lot...)and therefore should get "are" when my meaning to one only and it should get "is".