Get trays made up at your dentist's office. I found a local dentist that offered a new patient special that included x-rays, cleaning and trays with whitening supplies for $160.00. Great deal. A Zoom whitening kit (syringes only) costs about $40-$50. This will get you 8-10 shades whiter. I also did the light process when I lived in CA. It's very expensive ~$500, but it does work much quicker.