Sometimes my wax melts lose their scent quickly. Am I doing something wrong?

Wax melts don’t “burn off” like a candle; they slowly diffuse the scent until the essential oils have fully evaporated from the wax base. Typically, you can get 8-12 hours of strong fragrance per cube, depending on your warmer’s heat intensity. Once you can no longer smell the fragrance, it’s time to replace the wax cube with a fresh one.