Answer:
A skin have I, more eyes than one. I can be very nice when I am done.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
Break it and it is better, immediately set and harder to break again.
What an fill a room but takes up no space?
What is it that makes tears without sorrow and takes its journey to heaven?
No matter how little or how much you use me, you change me every month.