For the less courageous ones; magnesium oil and H2o2 works well; as a whitener and cleanse. Once and again I clean the kids tooth with H2o2; as they seem to get a yellowish layer on them.
I know only one person that doesnt brush her teeth at all; she hasnt in at least 5 years. (she is a psychiatric patient) To her dentist`s surprise she have had no cavities all these years; even if she has a terrible lifestyle with booze,drugs and wrong food. They arent white though; as she smokes a lot.
In my case; no fluoridated toothpaste in 15 years. No new cavities the last 10 years, no root canals. Since Iodine I havent seen the dentist at all. Dont need to; a couple of times if there was some pain I dropped som magnesium oil on it.