All teething bisquits I've ever seen have something in them that's off limits for my son. I've searched high and low...believe me. I've been to dozens of markets and stores.
I've now found some pure brown rice crackers. The only ingredient is brown pressed rice. I break them up for my son into smaller pieces. He loves them. They taste awful from my standpoint, but he LOVES them.
I'll have to check the brand name, but I found them in the cracker section at Sun Harvest store here in Texas. I'll look at the label and send you the name.
Elaine