My teeth are not clean and snow-white enough. I decided to clean them thoroughly. First, I clean the spaces between my teeth with dental floss. Then I clean the tooth spaces with a dental brush. Then I clean my teeth with an electric toothbrush on all modes, from the weakest to the strongest. I have a dental expander in my mouth all this time! Then I clean my teeth with the irrigator on the strongest mode. But my teeth are still not perfect. I'm still not satisfied with the results of the cleaning. There is a lot of hard plaque around my permanent retainers on the inside of my teeth. I take a hand scaler (dental hook) and start scraping off the plaque. The plaque is cleaned off very well. Hard dental plaque crumbles and you can see it. Finally my teeth are completely clean!