What can I do for transparent teeth? (photos)

Thank you very much for your question. I totally see on your your pictures what you are saying.
It is very natural for teeth to have some translucency. The matter of fact we as dentists like translucency on the incisal edges. It transmits youth and young age. 
A lot of patients though do not like translucency and they prefer thier teeth to be one color. This is possible to achieve with porcelain veneers. Not only the color can be changed, but the shape or position of the teeth. In your case, for example, 2 front central teeth can be made to look more rounded, if one desires. Also next two teeth can be made longer, so that everything looks aligned.
Your smile can be gorgeous.

Thank you for your question!  Some transparency on the edges of the teeth is what makes teeth look natural.  However, teeth may become more transparent over time because it is getting thin or worn down.  This can be due to any number of things including but not limited to how your teeth come together when you bite down, if you grind your teeth at night or the type of diet you have (ie.  high in citrus).  Talk to your dentist about what you can do to keep your teeth strong.  Even a referral to an orthodontist or invisalign may help correct your bite.Good luck!

Anatomically, the central incisors are translucent in the incisal 1/4 of the tooth because there is no dentin in that area. Since this area is predominantly enamel, light passes into and through this leaving a translucent appearance. In your case, however, you have an issue with your lower incisors, and they are wearing against your upper incisors which is causing enamel to thin out and chip away.  This is leaving an even more translucent appearance. You're going to need to address and treat the orthodontic problem that is going on with your lower teeth to keep from excessively wearing your upper teeth away.Hope this is helpful. Douglas Jopling,  DDS Dallas,  Texas area