I originally had the spray for Jackson and it worked but he HATED it. Something about the action of spraying into his mouth... you'd think I was killing him. Soooo after a few failed attempts, I sold it and bought the gel. Sooo much easier, IMO! He doesn't "like" it but he allows me to put a little bit on his teeth with my fingers without a big fight. I love it! His teeth are perfect at 2 years old except for a little tarter on the upper canine teeth but I also don't brush regularly like I should! I'm trying to get into better habits.