Yes, prolonged use of pacifiers have an adverse effect on teeth development, which is why I refrain from using it. Increased pacifier use is also linked to ear infections and speech and language problems. My baby sucks on her thumb instead. http://www.nytimes.com/2012/01/10/science/do-pacifiers-affect-babies-teeth.html
To some extent yes. http://www.babycenter.com/0_pacifiers-and-your-toddler_12254.bc When he is sleeping just make sure to remove the pacifier, Some babes will spit out. If you worry about the teeth development, try to use orthodontic pacifier instead. http://www.bundoo.com/articles/what-is-an-orthodontic-pacifier/
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thanks