If, or when, you run into habits that you do not like about your partner or find annoying, look and consider. Is it so important? How they brush their teeth? What they wear? Or what kind of car they have? Etc.
Would you want to end your relationship because of it? When you come across things you do not like, or can not get over, tell your partner! Directly! What are the problems?
Be nice and understanding about it, but not too much to where it makes him feel like you are putting him down. If you communicate, you can work towards a better relationship.