I followed the directions very closely. I got my mouth as dry as possible and then held the tablet in place for 20+ seconds. As soon as I removed my fingers and relaxed my mouth the reverse side of the tablet stuck to my gums and pulled away from my canker sore. I tried again the next day and hed the tablet in place for two minutes to see if it would adhere to the canker sore. It did, but the second i relaxed my mouth it would attach to my gums. I kept my inner mouth from touching my gums for a full 20 minutes by blowing air out of my mouth, to no avail. Perhaps it might stay attached to a canker sore positioned across from your teeth, but it simply can't resist your gums. THe result is that it sticks to your gums instead of your canker sore. This must me 1.0 version of the product. If they can engineer the backside of the tablet so that it doesn't grab onto your gums perhaps they will have a good product.