Disinfecting your toothbrush is not enough. There are other ways to keep it clean when not in use. First off, you need to store your toothbrush properly as this is as important as sanitizing it after every use.
You can also store your toothbrush in a hydrogen peroxide solution. A study showed that keeping your toothbrush in a cup of hydrogen peroxide is a practical and effective way to minimize bacterial growth. You need to change this solution before you place your toothbrush in every day. Make sure all the bristles are covered all the way by the hydrogen peroxide.
If you are living with other people, then you have to stop from storing toothbrushes next to each other. Several toothbrushes placed together inside a cup can cause cross contamination of bacteria among the bristles. Because of this, toothbrushes should be kept a couple of inches away from each other.
Although the most practical place to store your toothbrushes is in the bathroom, do your best to put it as far away from the toilet as you can.