You can, but you don't have to. There are two small drain holes directly behind the RADIUS logo on the handle that allow any water collected on the inside to drain out. We designed the TOUR this way so you don't have to keep your toothbrush open in order for it to dry.
If you do want to let it dry before closing it, you can leave it open with the RADIUS logo on the handle flat against the sink or counter.
It's your choice. You do you.
Check out the TOUR Travel Toothbrush here.
Email: contact@madebyradius.com.
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The RADIUS Customer Service Team