So... buy two tubes so you each have your own. Problem solved. You're welcome.
With just one tube you may end up bickering over how its used. With two tubes you can use your toothpaste however you see fit and it won't give your wife/husband/boyfriend/girlfriend anything to argue about. Its that easy to fix this problem, yet people seem not to do it. Plus as an added bonus you can also each pick your own preferred flavors or variety of toothpaste.
And one of the best parts about using two tubes simultaneously doesn't cost you any more than using one tube at a time. Each of you will use the paste as fast as you use it then buy another. Toothpaste isn't going to expire on you either. Theres no financial downside to buying two tubes.
Granted this exactly nobel prize worthy idea and I'm sure many of you out there already have your own tube of toothpaste. But I'm sure theres lots of people who share a tube for no specific reason. And doing so can cause unnecessary, easily avoided friction.
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