I have been a ' mouth breather' all my life . ( 70 yrs old now). I would say it became problematic as I entered by 50's. Waking up in the middle of the night with extreme dry mouth/throat. Then waking in the morning with a slight headache and low energy. I somehow landed on a 'mouth taping' site ( a US dentist I believe?). We are meant to breathe through our nose not the mouth. I have been mouth-taping now for about 5 years. I use
3M micropore 2" tape (make sure you get the 2" width). A very inexpensive solution to my
'mouth breathing' and widely available at drug stores + Amazon. I'm not a Dr and not sure of the physiology - but the odd time I have a 'stuffed-up' nostril...after putting the tape over my mouth..my breathing clears. Also, I would often wake myself up with my own snoring. With the mouth taped...pretty much impossible to snore.
Educate yourself. ie not a good idea to tape if you have been drinking or have a bad cold flu...there are lots of online articles/YouTube vids etc.
Also, I have noticed 2-3 nights a month...the tape was off when I woke up. I'm assuming it was the body's natural reflex to get it off...for whatever reason. One final thing, I learned from experience-- fold a tiny bit over at each end before you place it over your mouth...makes it MUCH easier to take off.