Germs can also build up in your toothbrush, so make sure to change it after you recover from a sickness. To reduce the spread of germs onto your brush, keep the head covered when traveling. Make sure to rinse it and dry it properly too.
If you don’t change your toothbrush, you run the risk of it accumulating fungi and bacteria that may infect your gums, leading to gingivitis. It can also grow mold, and you can get sick from using an overused toothbrush.