I have yellow teeth even after avoiding caffeine, soda and cigarettes and alcohol completely. I tried to mix 1 part of baking soda with a part water and one part hydrogen peroxide. It whitens my teeth only for that moment and gets back again after 2 days. I read that it damages teeth and like rubs off the enamel and I saw that there are a lot of lines on my teeth like they were rubbed by sandpaper. I cannot afford a professional treatment or expensive home kits. Anything I can do in 1500rs? Fast