How often should the catheter valve be changed. The catheter valve drainage bags should be changed every five to seven days or earlier if it is damaged. You.
Most dental professionals recommend changing your toothbrush or brush head every 90 days or sooner if you brush more than twice daily or longer than 2 minutes.
If you use a non-clumping litter, you'll have to change it more frequently than if you use a clumping one - probably about once a week if the tray is just used.