Tell us about yourself!
As far as mouthwash as mouthwash goes Listerine isn't effective, you want something with Chlorhexidine in. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3780369/
http://www.popsci.com/vitamin-b-can-increase-lung-cancer-risk Sounds toxic to me
There are a few apps on the Playstore which do that, but for me they are not doing the job. I was looking for an instant solution, I have >1000 negatives I want to run through (looking for photos of someone now deceased), and photo-save-switch to app, select saved image-reverse it takes at best 30odd seconds per. Does anybody know if there is an app to do this in live view?