Pacifiers

My 8mo won’t take to the bigger pacifiers. It’s the same brand, but he only sucks the 0-6m one and chews/spits out the 6-18m. He isn’t dependant on his pacifier; he only uses it to relax before bed & when we are in public (he doesn’t need it still, i just give it to him to keep him occupied, he does fine without it too), otherwise he doesn’t need/use it. So i know he doesn’t use it enough to cause damage but i don’t want to take the chance of keeping him on the 0-6m one and something going wrong with his jaw/teeth.