In the early days, they can confuse the dummies and nipples when they're learning to suck. I think. Plus, all that feeding will help to establish your supply.

We introduced a dummy with #1 after awhile (don't know how long sorry) when it became clear that he wasn't hungry, but was comfort sucking. As in, he'd be on the breast but clearly not drinking. Many parents are happy to let bub comfort suck, others like myself use a dummy to help bub self settle a bit. If he fussed and I didn't think he was hungry, I'd offer him a dummy, and if he actually was hungry he'd spit it out straight away. He was good at feeding by then too.

I can't remember how old he was when he ditched the dummy for his thumb. Younger than a year I'm sure. His front teeth do stick out a little, but I'd say that's the thumb if anything. My sis and I had dummies and our teeth are okay.

Anyway. I didn't plan to use a dummy, I was adamant I wasn't going to offer a dummy, and then after days of feeding a bub who clearly wasn't hungry, I gave dummies a try and they worked out for us.
You don't need to plan on using a dummy, dummies will always be there if it comes to it.

Your bub might not take a dummy anyway. I offered a dummy to #2, and he wouldn't have a bar of it, sucked his fingers from a really young age instead.