Due to a change in packaging of Professional Effects + 1 Hour Express Whitening Kit, you may receive either package depending on availability. Both packages deliver the same great whitening results with 1 use Professional Effects removes 14 years of teeth stains for a whiter smile Professional Effects delivers professional-level teeth whitening results 1 Hour Express removes years of stains in just 1 hour for a noticeably whiter smile 1 Hour Express whitens teeth faster than ever, even when there's no time to plan.Usage: Apply once a day for 30 minutes. You'll start seeing a whiter smile after three days, with full results in 20.