Always thoroughly rinse your toothbrush after using it because the germs that you just removed from your mouth will be on the toothbrush. By rinsing it off, you will remove the germs and the remnants of old toothpaste which can build up. Follow up the rinse by tapping the toothbrush on the edge of the sink to shake excess water off of it.
If you experience any tooth or jaw pain, then you need to see your dentist right away. You need to set up an appointment as soon as you can. The dentist must diagnose the underlying cause of your dental issue and correct it to prevent it from becoming a bigger issue later on.