Full Headgear mask with Full dentures-problems

New cpap user here. I started out with a nose mask. I am a mouth breather so after a month I exchanged for a full mask. I have been wearing dentures most of my adult life. Very little bottom bone.
I’ve left the dentures in, taken only the bottoms out, that worked for a while. Now I have been drooling and getting the sponge part of the bottom wet and irritation inside the bottom lip.
I’ll be making another appt with my supplier Apria in Roselle NJ soon.
Not sure what else to do.
resumed F20 for her..

How do you know you are a mouth-breather?
Some use a foam collar to keep their pie-hole closed while wearing a smaller mask.
Wearing dentures at night is unhealthy, uncomfortable, and the smell is not lovely.