hi i have been using dental white for about a week now does it work well yes is does. after using it for one week my teeth are about 5 shades lighter, it can make your gums and teeth sensitive,but when you start to use the after care gel all the sensitivity has gone great product. Try not to use too much gel or it will spill out into your gums and can burn. although i didnt use their mouth trays couldnt get them to mould tightly,so picked up some of ebay they were a better fit. really happy with product would definately recomend it. will upate in another week.