For whatever reason, a lot of us don't really think about disinfecting our toothbrushes very often. The truth is you should be regularly soaking your toothbrush to disinfect. Luckily, there's a vinegar solution for that. All you need to do is add two tablespoons of vinegar and a half tablespoon of baking soda to half a cup of water. Next, soak your toothbrush in the solution and allow it to sit for 30 minutes.
If you want, you can do this weekly. However, doing it occasionally is better than not doing it all. You can also disinfect your toothbrush by soaking it in mouthwash.