Take a look at this flattering review for the Lip Enhancement Kit--
"This kit really does plump the lips better than lip plumping gloss alone. I noticed it lasted about 2 hours. The directions say to use the plumping gloss (which tingles and feels "spicy") before you use the pump device; and to put it also directly on the device itself, as well. This burned the area around my lips and gave me "kool-aid mouth". So. I suggest using just plain chapstick or gloss, use the device, THEN use the plumping gloss. It seems to work better, and more comfortably. My husband was even impressed with the instant results; he was skeptical, but he's convinced now."