How is it profitable for them? If I get a prescription from my dentist and fill it at a pharmacy, how does my dentist make extra money from that transaction?
1. Floss first (!!!)
2. Use *any* electric brush
3. Spit, but don't wash out with water
4. Use fluoride mouthwashI personally treat it like gym: it's most important that you do it, not so much in what order or even how well.