The reason Biotene is expensive (best place to get it is a WalMart) is that it has the same natural enzymes in it that are found in your (now missing) saliva. What those enzymes do is reduce bacterial counts that cause periodontal disease, and other bad issues in your mouth. Baking soda may not burn, but it does not help you defend yourself against the bad flora, and it does not have flouride, which if you are disciplined (most are not) about using your trays every night is not important. If you are going to eliminate the toothpaste from them, you should at least use their mouthwash (again has enzymes) after your baking soda ritual.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.