Why Did my Bonded Front Tooth Fall out After Having It Done Ten Days Ago? (photo)

From the looks of your photo, you appear to have a very deep overbite. In this situation, your front teeth are under tremendous forces from the lower teeth as you move your jaw around. Your dentist must be very skilled in "occlusion" so that the bonded restoration is not placed under these tremendous forces.

There could be a few reasons why the bonding fell off of your tooth. Many times it is due to the relationship of your upper and lower teeth causing excessive force on this area. This force could be more than the material will hold up too. Also, there could have been a problem or some contamination in the bonding process, thus leading to a weaker bond and regardless of your "bite" it would fail. I would suggest seeing the dentist who performed this and have them review your bite and if all is ok, then re-bond the area and make sure all the proper steps are followed to make sure it is bonded properly.

It could be from a poor bonding done by the dentist or as others stated could be your bite.  I would consider veneers or a crown to fix the problem.