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Yep, you shouldn't rinse your mouth, because a proper toothpaste has fluoride, which helps remineralize enamel. Keep in mind it won't restore already decayed enamel though.
Anyway, I am not that sure about electric toothbrushes. At least it's not necessary. On Wednesday when I've been on dental check-up, I asked my dentist whether electric toothbrush would be a good idea. She said "Well... it can be... but you already do pretty good job of cleaning your teeth, so I just recommend you stick to that." I just use a regular toothbrush. However, just the brushing does take me a while. About 10-12 minutes. Yeah.
Well, something that could be a tip is xylitol chewing gum. Most sugar-free gums use xylitol. It is artificial sweetener that's actually good for teeth. It helps remineralize teeth like fluoride, remove plaque build up, and it kills acid-producing bacteria. That is because the bacteria consumes it like regular sugar, but it can't process it, so it just dies. You can also buy xylitol as a powder, because it's, well, a sweetener.
Now to the disadvantages of xylitol: Consuming larger amounts (I think it's just around 25g) can cause diarrhea and cramps. It is also extremely toxic to dogs. Just 100mg/1kg can cause them seizures and 500mg/1kg can cause death. Obviously that's just approximate, so keep your dog away from xylitol.
Disclaimer: I am not a professional in this field.
10-12 minutes????? You're going to get toothbrush abraisions
Electric toothbrushes are excellent for stimulating the gums and keeping them in good order so they don’t recede. The Sonicare are especially good for this reason.
I do the xylitol gum! I think countries in asia regularly markets this as part of good dental hygiene for those reasons you listed. Some of the gum containers advertise, white healthy teeth. Not sure why the US doesn't promote xylitol gum more.
The USA wants sick and diseased citizens because it’s good for the economy.
On electric toothbrushes, my hygienist basically told me: Imagine how many times you go back and forth manually with your hand when brushing. Now compare that to how many times an electric toothbrush can do the same in the same time frame. So the latter is more effective.