There are various techniques on preparing teeth. Your situation is most likely what is called a supra-gingival preparation. This is by far the easiest way to maintain the margin between the crown and the tooth as the margin itself has to be kept clean to avoid future complications. This however, produces the least cosmetic outcome. Sometimes it is also caused by the gum line receeding over a number of years. Ideally the preparation - the line between your natural tooth and the bridge - should lie under the gum in front where you can see it and higher up in the back so it can be maintained. If your tooth is grey it could be that the nerve had been taken out at some stage so that the tooth is essentially dead and discoloured. The gap under your bridge is most probably due to the recession of your gums following the extraction of your teeth. Fitting a bridge too soon after the extraction has meant that when your gums have healed over time, they have shrunk & left you with a gap. These risks are usually outlined before treatment. Fortunately, if you are not happy with the bridge and your canines are still in a good condition, the bridge can be taken out and a new bridge made. Alternatively, you can have front implants placed. Please feel free to call me to arrange a free consultation with one of our dentists on 361 2060. Regards Wolfgang