Seeing as how there’ll be a lot more masks at poker tables in future and less mouth tells available, Zach Elwood provides this complete 15-minute video from his http://readingpokertells.video series available to the public.
Mouth tells can be valuable but they are still a small percentage of tells out there. Currently, there are 12+ hours of content in my Reading Poker Tells Video series. Just starting out learning poker tells? Check out my book Reading Poker Tells on Amazon or in ebook at https://readingpokertells.com/products.