There are people with lots of issues, there are people who never had issues better toothpaste was common. It really depends on a lot of factors including diet. Don't be so quick to judge others' approach to dental hygiene.
Would you read my sibling comment I linked, you would know that the toothpaste is not that important. You can successfully brush without it and not have problems. Yes a sugary or acidic diet is worse for your teeth.
The 4-6 minutes and 1-2 minutes interdental is based on an estimate by a professional dental hygienist. The most correct instruction of course being that you should brush your teeth until they are clean.
The 4-6 minutes and 1-2 minutes interdental is based on an estimate by a professional dental hygienist. The most correct instruction of course being that you should brush your teeth until they are clean.