I have been told that I am a clencher. I have had bottom molars #18 & #19 root canaled 6years ago. Recently, I had excruciating throbbing in tooth #19 and had to have it extracted. My question is which would be better a bridge between tooth 18 which has already had a root canal and #20 which is a virgin tooth or a single implant for #19 even though I am told I am a clencher and it may break?