I remember going to the dentist about 8 years ago for my checkup and teeth cleaning. After my cleaning I always ask my dentist (or dental hygienist) if I should be doing anything different, or if there are any new toothpaste, or other products I should be using. That's how I found out about electric toothbrushes.
When I saw the price for these toothbrushes, I was not interested. But then I thought about how much I spent to keep my teeth in good shape with dental visits and teeth whitening products, and figured, it's not that much more, and I bought one.
So I get home, get it charged up, put some toothpaste on it, and turn it on. Toothpaste everywhere! (Note: Put into mouth before turning on.) Once I cleaned up the toothpaste, I tried it again, and this time it felt as if my teeth were going to shake out of my head. Why did I buy this thing? After reading the instruction, I found out that it had different settings, and I put it on a lower level until I got used to it. These days, you have many more options than when I bought my first one. One of the features I like best is that many of them have timers, so you know how much time to spend in different areas of your mouth. I found that when I brush now, I spend more time brushing, as I wasn't very good at keeping track of time when I brushed manually.
Since many people still use a basic $3.00 toothbrush, as I also did for many years, it's obvious that they work. It comes down to personal preference. However, I would never be without my electric brush now, having used one for so many years.
If you decide that an Electronic Toothbrush might be the best choice for you, Google "buy electric toothbrush" and you will probably find the best prices and information. Ask your dentist, as I have a feeling they would also recommend you buy electric toothbrush.