I have the same problem with the left side! Beyond being right-handed, there's the angle I have to take because of how they stand on the sink vanity. But at least they actually seem to enjoy brushing: they love the toothpaste enough that that's their treat.One of my cats turned up with gingivitis by his first birthday so I feed at least some meat chunks every day and bone once a week, AND brush teeth. Thankfully this has worked, even though I'm not sure how effective my brushing is. I'm right handed and I find it really hard to brush the cats' left side. It took a LONG time for them to get used to brushing, and one cat still isn't entirely with the program - I have to get him when he's relaxed and sleepy. The trouble is he's not very food motivated. The other one loves it so much he starts meowing at me when it's close to toothbrush time. And sometimes he opens his mouth and tries to rub his back teeth on the brush for me! I think he was easy to train because he loves the toothpaste and also gets bits of treats (kitty crack) in between brushes and afterwards. And I found that it's easy to brush too hard which probably is uncomfortable, when I lightened up they got more cooperative.
Yes, break the nugget up, add water, and stir, pressing on the pieces as you stir. (I think a fork works better than a spoon.) One of our cats likes the pieces to be small chunks (nothing bigger than, say, the size of a pencil eraser or they won't rehydrate) but the other will eat it if it's practically pulverized to powder and then rehydrated. You may need to experiment a little to find out which way your cats prefer the food.
I got a freeze dried today and didn't think I mixed it up right with the water. Just put less than half of the amount of nuggets of warm water and stirred. Should I be breaking up the pieces? Is it supposed to sort of have a "wet cat food" consistency. It looked more like the pellets absorbed a little water but were more just floating in the water.