I've tried that stuff and my dog hates it. He also really hates application nozzles going anywhere near his mouth because they can puff air and make weird noises.
Find an enzyme paste or gel that's got a more dog-friendly flavor, like chicken or peanut butter. Start with letting your pup lick a little from your finger, then work slowly up to touching one tooth, to running your finger over one side, to the whole mouth. I've found it easier to use a bit of gauze or a microfiber finger brush around my finger than to try to introduce a real toothbrush, but do whatever works best for you/your dog.
Find an enzyme paste or gel that's got a more dog-friendly flavor, like chicken or peanut butter. Start with letting your pup lick a little from your finger, then work slowly up to touching one tooth, to running your finger over one side, to the whole mouth. I've found it easier to use a bit of gauze or a microfiber finger brush around my finger than to try to introduce a real toothbrush, but do whatever works best for you/your dog.