Why are my teeth translucent/transparent? Is there a way to fix? (Photo)

Translucency associated with front teeth is typically considered to be an attractive characteristic.  It is not something that can be bleached out.  If you would like it removed your only option would be to have porcelain veneers.  This would be costly and not something that I would recommend for you, but can be done.  Good luck.  

Javier, thank you for a great question. What you are describing is a very natural variation of normal tooth. It most like always has been there, but you were not aware of it. You can try whitening, but most likely with a limited success. If you do not like the look so much, porcelain veneers is the best solution. There are multiple brands on the market. The best thing to do if you are interested, is to have a consultation with a experience cosmetic dentist, who can examine you properly and guide you to the best outcome.
Good luck

Once you whiten your teeth fully, you will see the glow of translucency in a different light. It will, as some of the clinicians have said here, be a beautiful characteristic. Whether you then want to place veneers is a decision you can make at that time. Good luckThomas Dey, BDS, MSc

translucency at incisal edge gives natural look to the teeth. so even in artificial crown and veneers will incorporate that . so do not even think to remove that by any ways, otherwise teeth will look artificial.

Often the translucency of teeth is from uneven wear, so the enamel is thin. In some people their enamel is simply more transparent and the dentin below is easily seen, but near the tip the dentin is not there.  This displays the "lobes and mamelons".  Bleaching or whitening will have little effect, so veneers are likely the only satisfactory option.