Hi and Thank you for your question:
It appears from the photograph that you have decay that is affecting the root of tooth #6 (canine). The location of the decay is such that it would be difficult to correct and it may even mean getting a root canal and therefore a crown afterwards. The recession of the gum those not help and because your smile line is high this would cause a significant esthetic defect. My suggestion would be to remove the tooth and place an Implant in an appropiate location. Please visit an Oral and Maxillofacial Surgeon for consultation regarding the implant and your dentist for crown on implant. Good Luck to you from your friendly Oral Surgeon!!!