Are Pacifiers Bad for Teeth? Unfortunately, pacifiers can cause problems for your child, especially with their oral health. The American Dental Association notes that both pacifiers and thumb-sucking can affect the proper growth of the mouth and alignment of teeth. They can also cause changes in the roof of the mouth.

At what age does a pacifier affect teeth?

As early as about 24 months of age, continued use of a pacifier may encourage oral issues.

Do pacifier teeth affect permanent teeth?

Prolonged oral habits may cause your child's upper front baby teeth to flare out and give the appearance of an “overbite”. If your child continues to have an oral habit past age 6, the permanent teeth will likely become affected, and you should discuss a plan to help your child stop the habit with the dentist.