I was recommended sonicare almost 20 years ago by a family dentist. I still have that toothbrush, although spare heads are now almost entirely dried up so I will have to buy a replacement soon.

I've always received glowing reviews from dental hygienists EXCEPT three times when I switched to either a manual brush or a competing product when I developed a small cavity within about a year. The last one was probably 5 years ago and I continue to get good reviews, even though I usually only brush once a day.