NovaMin

Would you please pass on a reliable source? I'd like to try.

Any non-US Sensodyne Repair and Protect. You can get them off Amazon at a premium price. They will all claim to be Canadian but you will almost certainly get Turkish or Indian. However for you this doesn’t matter because they have the same active ingredient.

I use this stuff and it is really surprisingly effective. I have no idea if it will turn my tonsils into concrete or something down the road, but it does work.