Interestingly, both the thumb and the pacifier move a baby’s teeth similarly. Sucking on a thumb or a pacifier is not always harmful unless it develops into a habit. Even using finger guards can turn into a bad habit. You must ensure that the baby stops before they reach the age of three. Beyond that age, it can impact their dental development, resulting in crooked permanent teeth, a misaligned bite, and speech issues. However, remember that the pacifier can be removed, whereas the thumb cannot! As a result, pacifiers are preferable to thumb sucking.