Sure, teeth whitening may seem an odd self-care choice to some, but not responsible Capricorn. This sign has a can-do attitude and unwavering focus that makes setting aside specific time to take care of their teeth simply the most prudent use of that time. There are several options to make this happen, like sitting down with the high-tech Glo Science GLO Lit Teeth Whitening Tech Kit ($149) or picking a brush-on gel like the Tarte Pearly Girl Vegan Teeth Whitening Pen ($22) or Glo Science GLO Lit Teeth Whitening Vials 3 Pack ($24) instead. Now that's discipline.