Method 3 for Cleaning Your Toothbrush: Soak It
Some people choose to soak their toothbrush anytime they are not using it. Unfortunately, many of those same people use the same soaking solution several days in a row, which can actually hurt, rather than help the problem. A solution is to soak your toothbrush in undiluted vinegar overnight, once every two weeks. The vinegar kills the majority of mold, germs and bacteria.
For a quick soak method, put your toothbrush in a clean mug and cover the bristles of the toothbrush with boiling water. Keep the toothbrush in the boiling water for three minutes and then use as usual.