Babies use sucking to calm and settle themselves.
It's unlikely that your child will continue sucking her dummy well into the childhood years when it might threaten proper dental development. You're unlikely to be successful, and it will only lead to unnecessary struggles and frustration for both of you. If you decide to restrict her access to a dummy, help her find her thumb, or offer her a blanket or a soft toy to comfort herself instead. As with any source of medical or health care information, you should as a preliminary matter satisfy yourself that the credentials and experience of the source are suitable. The information provided through the Ask the Experts service is a general educational aid designed to help you discuss your unique medical or health concerns with your doctor or qualified health care provider.