When installing oak bathroom furniture, take the time to care for it properly. It is best to unpack the items carefully using a blunt object to avoid damage to the wooden pieces. Once the pieces are unpacked, clean them thoroughly and check for dirt and residue. After cleaning, you should apply a coat of Danish oil to them. Most oak furniture will already have a protective layer of oil. If not, you can sand and refinish the furniture.
Source: https://www.allblogsolutions.com/important-tips-to-care-for-oak-bathroom-furniture/