This is for all english teachers, is it FULLER or MORE FULL? The wife and I are having a little disagreement.?

Update: For instance. If you have two cups and one has more in it....you would say "The one on the left is MORE FULL." or "The one on the left is FULLER." Another instance... Our mother walked into the house (she had a hair piece in her hair) and it was said to her "Mom your hair looks... show more For instance. If you have two cups and one has more in it....you would say "The one on the left is MORE FULL." or "The one on the left is FULLER."

Another instance... Our mother walked into the house (she had a hair piece in her hair) and it was said to her "Mom your hair looks FULLER." or should it have been " Mom your hair looks MORE FULL."
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