Not if they're used for a limited time. I usually recommend that parents choose the square, orthodontic type of pacifier (look for the word "orthodontic" on the packaging), because it maintains a more natural alignment between the upper and bottom teeth. Pacifiers with nipples that resemble those found on a baby bottle tend to promote malalignment (buckteeth) if used beyond 3 years. A child shouldn't use any kind of pacifier beyond about age 4, because it could cause problems with permanent teeth. Also, never dip a pacifier in a sweet liquid, because that can cause tooth decay, or honey, which can cause botulism poisoning in children under age 1.
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