Chinese believes that having pacifiers on all the time with young infants would cause "bux bunny teeth", is that true?

From what I've gathered, it is unlikely that this will damage the alignment of their teeth or jaws, at least not till their permanent teeth start emerging (which is around five or six). Pay attention to how your child is sucking his/her thumb or pacifier. If your child simply rests his/her thumb or pacifier passively in the mouth, there is a lower chance that it will lead to dental problems as compared to those who suck aggressively/vigorously.