I hear that using tissue to wipe after urination is bad for your healthy. it is said that we should only wash it by water. do we also need to dry it?

Nothing wrong...: It is nothing wrong to use tissue to tap & soak the last lingering drops of urine, which is effective and simple, especially in some with postvoid dribbling, which could be helped with urethral milking for men and draining the possible drops in the introitus by leaning forward. More? Ask experts like urologists for specifics and details.