My teeth aren’t terrible but not an even colour due to years of using various teeth whitening toothpastes etc. 18 months ago went to my dentist to get them whitened. As I get sensitive teeth they recommended a tray with the filler stuff to do at home. They were ok, took a while to change but they went a couple of shades lighter but they did end up sensitive and had to stop. I still have the stuff so will start again tonight but I wondered if there’s a simpler way? Can it be permanent, is there any other option for sensitive teeth? I know a lot of people have veneers which I don’t want or is it just not sustainable to have them white forever?