Hello. Since my now 25 month old daughter has had teeth, I've used the Gerber infant toothbrush and toothpast to clean her teeth 2x daily. I now bought the Toddler version of the Gerber paste. Now, this is the type that is not meant to be spit out. At what age do you reccommend begining to attempt the "spit out" toothpastes? I'm clueless on this. Thanks! :)