At first, anything new that you put into your mouth is perceived as food. And your brain thinks, am I supposed to eat this. Increased salivation for the first few nights happens in most of our patients, but it does subside soon afterwards– once your brain figures out it’s not supposed to eat that thing. It might be a good idea, especially if you have really nice sheets and pillowcases, that you break out the old set or perhaps cover the extra nice pillow until those salivary glands calm down. I’ve seen this last for months in the most extreme cases. But usual and customary would be no more than a few days.