I am sad to say I’m a smoker. after I discovered this I have never even tried another toothbrush or toothpaste. My teeth are whiter and I know this as my dentist did a filling which he tailored to the colour my teeth used to be. Now that filling sticks out as everywhere else on tooth is lighter and not yellow anymore but filling is yellowy. A definite for a smoker. Also my husband hates smokers breath and this is the only toothpaste I found that helps with that, but to be honest it helps with this for only about and hour and a half in the morning but at night when I brush I don’t wake up with that stale tobacco breath in the morning.