No, thanks to the natural antimicrobial and antibacterial properties of the built-in protective layer, blood is safely trapped and bacterial growth is inhibited, preventing unpleasant odours.
It is important that you wear your period underwear for a maximum of 12 hours at a time for sanitary reasons. After each wear, you should also rinse them by hand in cold water.
To take the best care of your gotyu, follow the detailed care instructions found in this faq under Care.