Hi Amanda, Both my daughters had dummies and at about 2 1/2 years old coming up to nursery I decided that they should stop having their dummies, My oldest daughter gave hers to the easter bunny in exchange for chocolate eggs ! and my youngest gave me hers on xmas eve for father xmas to take, and they never asked for them after that, Don't know if it will work for you but also when my cousin was little her teeth started to deform because of the shape of the dummy
Best of luck
Joanne
Both of my kids had dummies until they were 4. It was on their 4th birthday that we agreed there would be no more dummies. Although for both I tried to limit the dummy to nighttimes..or emergencies. Both have nice teeth.....and I am sure I saved myself a lot of whining.
But did spend a lot of time on my knees searching for dummies....and a fortune on buying them.