My DS was a comfort sucker, too, OP - except, he wouldn't... yep, that's wouldn't... breastfeed after the initial one. Refused to latch on, refused to suckle, screamed until in desperation (and to the disgust of the midwives) I gave him a bottle. Well, it was either that, or he starve to death, quite frankly.
Within two weeks, he also had a dummy. And that is because the only things that would keep him quiet between feeds were (a) being driven around, and (b) the little finger on my right hand.
He used his "binky" until he was 3 or 4, sporadically, when he was teething, unwell, needed comfort. He is very intelligent (according to his school reports), can speak without any issue, and has perfectly aligned teeth (as do I, who still has been known to thumb-suck in her sleep... and I'm 40).
Please, OP, ignore the "you'll damage their teeth", "they won't learn how to talk/walk/use the toilet" naysayers. Do what is right for your baby.
Incidentally, my older child didn't have a dummy.
Each child/baby is different. And if yours comfort suckles, then a dummy will help teach her to self-soothe (and give you a break).