Take him/her to the dentist first!
I weaned my 22 month old off his binky last month because I didn't want him to be two and walking around with his binky hanging out of his mouth while talking in full sentences. Plus I was concerned about orthodontics.
Well fast forward to today, when the pediatric dentist examines DS and says to me, "does E use a paci?" To which I proudly replied,"nope we are all done." His reply, "well I'm going to tell you to give it back to him!" Apparently DS has an underbite that can potentially be corrected by further use of a paci, or else his jaw may grow funny and he will have to get braces later in life.
Definitely wasn't expecting that one! DS just had his greatest wish come true :-). So take your toddlers to the dentist