8 Years of Pain Many root canal 3 crowns gum surgery still contained by Pain!?

I chipped 1/4 of the tooth 3 times during adolescence the tooth was cap each time and caused without doubt no pain.
Age 17: For cosmetic reasons the 1st dentist settled to make a crown there be no damage to the tooth otherwise
From now on the tooth cause constant pain
http://i15.photobucket.com/albums/a390/F...
Age 19: The crown was incredibly painful from day one Dentist #2 redo the crown Root canal was perform Peridontist also performed gum surgery at this time. Pain continues
Age 20:Root canal perform by 3rd dentist puts on new crown made of different material,Pain continues.
Age 21:4th dentist decide to redo root canal because it be still infected. he left it open. I finally have relief that I hadn’t had since I be 17. painfree 6 months.Age 22 had weekly root canals for a month and a partly. no help.
Age 25-still in constant throbbing thinking extraction only option. It is my front top tooth the gums surrounding the crown are grey.
HELP. What's subsequent

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Answers:    Remove the tooth and get an implant