After obturated this canine, just 2 months and 13 days after cleaning and shaping. The pulp of that tooth obviously committed suicide: no caries, no restauration, no trauma history, just a discoloration and a lesion on the X-ray. C+S to 40/06, place Ca(OH)2, obturate with Kerr PCS EWT and System B Obtura. Double pdl looked like two canals, but it was just a sandclock shape.Isn't it amazing how fast that canine heals?