I recommend the Hanssem portable toothbrush sterilizer.

Even though I make sure to thoroughly dry my toothbrush after brushing it at the office, I always feel uneasy about storing it.

Even though I had a toothbrush head cover on, it seemed like an environment where bacteria could easily multiply.

So, while searching, I found out about USB rechargeable portable toothbrush sterilizers. Among them, I purchased and used a Hanssem product.

You can charge it via USB in advance and use it once it is fully charged. Insert the toothbrush and close the lid; a blue light will turn on, and sterilization will proceed.

Storing my toothbrush in a portable sterilizer gives me peace of mind, and it is also convenient to keep in my office drawer, so I bought one and have been using it well. I take it out frequently and wipe the inside with disinfectant wipes.