For proper dental care, it’s important to remember to brush twice a day and floss daily. Brushing twice a day can cause wear and tear on your toothbrush, so it is recommended to replace it every three months, or sooner if the bristles are frayed. That means you should be using at least four different toothbrushes in the course of one year. So, let’s do the math! If you have five members of your family, and each one uses four toothbrushes a year, that’s 20 toothbrushes consumed by your family in one year.