I am an avid espresso drinker and you really know what it does to my teeth. These whitening strips from WSD Labs are 2nd to none. They unquestionably give a whiter seem and will compete an experienced whitening session within the dentist. �?"No slip" technological innovation; extra snug to use: https://alexisixmao.ktwiki.com/1380525/5_simple_statements_about_bleach_whitening_strips_explained