I never ever thought I'd use one. When I was a child, anyone like my mother or granny would tell you snifflily that they were a very 'lower class' thing.
However as a very young baby my dd2 had bad colic, and in desperation I tried a dummy, since I had read that it might give her some relief. And it did seem to, and she carried on with it. We were living overseas at the time and travelled a lot in the summer hols, all over the Uk seeing friends and relatives, and dd2 would happily go to sleep anywhere if she had her dummy and her blanket. TBH it was a godsend from that POV.
She didn't give it up entirely until she started school, but she has beautiful teeth - they were not affected in the slightest.
Dd1, on the other hand, sucked her thumb from a tiny baby and must have been 20 before she stopped entirely. And it did affect her teeth. You never see kids at school sucking dummies, let alone after they've learned to drive. I'd rather a dummy than a thumb any day, and that's something I would never have thought I'd say.