Mine: dental floss. I love the feeling of freshly flossed teeth and gum surfaces and even the process of flossing. When I have my occasional bouts of depression and anxiety, which are thankfully short-lived these days, hygiene stops and when I return to normal afterwards, flossing is the very first thing I do that signals 'the crisis is over'.

I walk down memory lane and can't believe I used to live without flossing back in the day.