I thought I'd try something new. So Billy:
and I went here:
Wielding little more than some aluminum foil and a Q-Tip, I got to work.
As it turns out, eyelash glue lives a double life as a Dexcom adhesive repair tool. Roll the Q-Tip around in the gooeyness, swipe it under the flappy adhesive, and press down for several seconds. Then, and this is important*, don't move that area for a few minutes.
*Note: I actually found that this didn't work well (and I needed tape afterall) for where I had my Dexcom sensor, which was precariously close to my armpit. I think this would work well in a less high-traffic area (read: a leg or hip, or maybe just more to the outside of an arm), and also if I had kept my arm stationary for a few minutes to let the glue set, so I'll be trying this again. Someday.