I recommend getting a battery powered toothbrush. Don't bother taking one with a charger. It will be more to pack and plug in, and there's no guarantee that even if it is dual voltage, there will be a receptacle in the bathroom to plug it into with the adapter. Pay close attention to what the guy said about the shaver plug receptacles.
I use an Oral B rechargeable electric toothbrush at home. My teeth are not going to fall out if I use a regular toothbrush for a month-long trip. But on our trip in the fall to Greece, I decided to try a non-replaceable battery type you can simply toss when the battery runs down. Even though it did not have the round head like mine at home, it worked great. That is, until I left it in our room on Hydra and had to buy a regular toothbrush in Nafplio. Amazingly, I managed to brush my teeth everyday just the same. Next trip I will once again take a non-replaceable battery powered toothbrush, but I'll be more careful about packing as we change locations. You can find these toothbrushes in the normal places like Walmart, Walgreen's, Target, etc. I wouldn't get one that requires replacing the batteries -- to heavy and too much hassle.
My husband has taken his 2012 iPad to Europe for the past 3 years. He uses the charging gear that came with it, plus a plug adapter. That's worked in Italy (and many other countries) just fine. He uses Wi-Fi in our room on the iPad to keep up with email. And he loads books on it to read. We don't go out much in the evening.
In the past, I took my Panasonic Lumix camera with its battery charger. It charged well with a plug adapter in even more countries. The same was true for my Kindle Fire. Last year we finally ditched our flip phones for Moto X smart ones. So my husband now takes 2 devices, his iPad and his Moto X. I now use my Moto X as my only device for pictures, reading books, Wi-Fi, keeping up with email, etc.
It may not sound like much, but the camera, the old phone and the Kindle along with their cords and charging accessories added up to well over 2 pounds. My smart phone, including its wallet-like case and charging accessories, weighs about 8 ounces. That's a big savings in weight in my carry-on personal item.
If you plan to charge everything at once, you will need a plug adapter for each device. Plug adapters are small and cheap and we have lots of them. You can get them at Best Buy, Walmart, Target, Ace Hardware and typical travel stores like REI among many other places. Buying locally is probably your best option this late before you leave.
Due to the frequent lack of receptacles near the head of the bed in most lodgings and my husband's need to use a CPAP at night, we opted to buy a European power strip when we were in Belgium. Most people say that's nutty and expensive and recommend taking one that will handle the load from here so that you need only one plug adapter over there, but it was my husband's choice since his is the greatest need. He usually ends up plugging it into the closest wall receptacle, then plugging his CPAP with an adapter, his iPad with an adapter and his phone with an adapter into the strip. There are 4 receptacles on the strip, so he can plug in the bedside lamp (no adapter required) if needed. Having only my Moto X, I need only one receptacle relatively close to the nightstand on my side of the bed. Most phones come with a very short USB charging cord, so when we got back from Greece, I got a 10 foot one, the longest I could find at Best Buy.
I'm sure this sounds complicated, but once you do it, it isn't. The most important thing is that you leave the 110 only items at home.