Yes, pacifiers and thumb or finger sucking can definately cause the teeth to not line up correctly but usually only the front teeth. The thing is these are baby teeth and the real problem begins if she is still using the pacifier or thumb/finger sucking when her adult teeth start to come in, which is usually but not always around age 5-7. So you have a couple of years. Start now because if you take away pacifier, she may resort to her thumb and you will need to try to break her from it. But, that can sometimes be impossible because even if they don't go to bed with their thumb in their mouth, its usually there by morning. If nothing works just keep in mind the POSSIBILITY of your child needing orthodontic work in the future. Of course there is a chance that everything will be fine, my sister sucked her thumb up until she was 10 or so and we always knew she would need braces or more. She eventually grew out of it and has perfect teeth!
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pacifier sucking and underbite 
