14. Toothbrushes

Now, if you change your toothbrush as often as you should be changing it, you’re probably buying a new one every three months or so – but if you are doing that, you’re wasting your money.

Assuming you’re responsible enough to be visiting the dentist a couple of times per year, you really should be getting a completely free toothbrush every six months. Even if you only get one toothbrush per visit, you’re still having to buy less toothbrushes than you would normally – but a real pro-tip is to ask for two free toothbrushes every time you visit!