@shinjikawata,
First label: "Dense & Caramelly-Sweet"
Second label: "Dense, Caramelly Sweetness"
I think they're both okay although I prefer the first because it's hard to see how density could be sweet. Technically I'd say you need the hyphen for much the same reason, but out of 5 million casual customers only one or two fanatics like myself would entertain any difference
You're to be congratulated Shin for your intense interest in our silly language