Dirty mouth feeling anyone?

I have really good dental hygiene at home—floss every day, brush morning and night, and I even tongue scrape. But lately my mouth just never feels fully clean. Even right after brushing, it still feels kind of foamy or like there’s a film in there. My breath isn’t bad, it just feels “dirty” or not fresh. I also deal with constant congestion, especially in the evenings, so I’m wondering if it’s all connected—like sinus issues, post-nasal drip, or hormone changes. Has anyone else experienced this during perimenopause?