I use the gel. I got it from Sassypup and she offers free shipping on it.
It is great stuff! It probably works best if you use it like toothpaste but I just take a pea size on my finger and stick it in their mouth. Mine don't like the taste at all. I saw a difference after just a few days. I highly recommend it!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226