DS1 is a binky boy. As you all know after numerous breastfeeding issues he self weaned to a bottle at 3 months, and so got his comfort from his binky thereafter. (Could not get him to latch even as a comfort measure.) He never even considered using his fingers at any point, and still won't at 18 months. I'd love to get rid of the stupid binky, but he is cutting molars & eye teeth right now, so I don't see the binky going away until after he has finished teething.
DS2 is the opposite. Loves him some bewb whenever he can get it. Always spits out the binky after two sucks, and will happily chew on his fingers or thumb to self comfort when he can't have Mama. I really like that I don't have to remember to take a binky with us for DS2 when we go out, as its a disaster if we forgot DS1's binky and he needs a nap.
Before I became a Mama I said I'd never use a pacifier. I HATE them. DS1 however had other ideas, and it was and is the only thing that calms him down to go to sleep when he gets overtired (well that and his sleepy bear blankie.)
I think that its a personal thing not only for the parents but also with the child too. Either way they will some day outgrow their need for them.
As for the dental thing DH was the pacifier child and he needed the corrective work for an overbite. I was the thumb sucker and never had anything done to my teeth, and I was at least 5 before I stopped using my thumb to go to sleep.
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