In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Some dentists prefer using the oral rinse for _ to five days at a time.
[EX A]: three

[EX Q]: Essential oils have a non-toxic, residual effect of up to five months from just _ application.
[EX A]: one

[EX Q]: Some people like to feed their pets once a day and some up to _ times a day.
[EX A]:
three