As our Heart Melts are larger than most melts on the market, 1-2 heart pieces in your warmer is enough to fill a large room for hours. Use only in tealight and electric warmers approved for wax melts. Use 3-4 hours at a time and never overload your warmer. The wax can be re-melted until the scent dissipates. For easy cleaning and to change your melt, let the wax reset, then warm for a minute or two and gently push out the remaining wax. It should easily pop out as one whole piece. Always keep away from children, pets, and flammable items, and never leave unattended.