I was attracted to the name Derma Answer and decided to buy it. As the name suggests, it does have a slightly tingling sensation. The texture is loose and thick, and it spreads quite easily. I think one dropper is enough for the whole face. As for the effect, I feel like my skin has become much firmer rather than finer. It stays supple for a long time, even the next day. However, I'm afraid to use it in the morning, so I only use it at night.