I like using toothpaste tablets but they’re expensive and the store where I get them doesn’t always have them in stock. Recipe: Xylitol, Microchrystalline Cellulose BP, Dicalcium Phosphate Dihydrate, Sodium Bicarbonate, Sodium Lauryl Sulfoacetate, Mint Powder, Menthol, Sodium Fluoride.
Maybe this recipe?
Maybe use hydroxyethylcellulose? About 1%? The brand I’m currently using containts microcrystalline cellulose (MCC), and some brands contain up to 70% MCC. I can’t find any good sources for MCC, I guess calcium carbonate has the same function.