Answer:
Unfortunately, there is no definite answer to this question. It really is a matter of personal opinion :D It can depend on the type of society you have been brought up.
Generally though, attractiveness is linked with good health, cleanliness and general well-being.
Therefore, to be 'attractive' basic things like cleaning your teeth, washing your hair and having a good skin care regime can help.
However, to some, attractiveness is about personality not looks; such as having a sense of humor, being kind but also being yourself.
Except but believe me in some times being too attractive isn't a mandatory just be hygenic about your lifestyle and many women like personality but that's just on occasions