LONDON (AP) — Toothbrushes used to be simple, powered only by your hand so they never broke down. Nowadays, rechargeable electric toothbrushes are increasingly popular because they make brushing easier and more effective, but they are a headache when they stop working properly.

Inside an electric toothbrush’s waterproof housing is a battery that powers a tiny motor which rapidly rotates or vibrates a replaceable brush head. The batteries are usually rechargeable but don’t last forever. The question of their longevity, and toothbrush repairability as a whole, is the subject of many online forums.

If you’ve ever owned one, you’ve probably noticed recharging intervals becoming more and more frequent. At some point you might decide to throw it out, adding to the world’s growing pile of electronic waste.

But all is not lost. You can pay someone else to repair it, or — with some online help — do it yourself. Here are some pointers: