Even better: purchase an inexpensive strap wrench with a rubber strap (something like this) and keep it in the kitchen for stubborn jar lids. For the jar lids that even a strap wrench alone can't quite open, I've had success by using the strap wrench on the lid while holding the jar itself with a silicone oven mitt (or oven mitt with rubberized grip--the rubber band trick might work here as well).

Another non-minty toothpaste: Tanner's Tasty Paste (here's an amazon link for their Vanilla Bling flavor, which is indeed tasty: https://a.co/d/eyJlgCk). It's apparently intended for kids, but it has the same active ingredient as regular fluoride adult toothpaste!