My wife had an implant. Her tooth basically self-destructed for some unknown reason. The root shriveled up.
The eventual cost was $7000 or thereabouts. Initial estimate was for $3000-4000, but the bone didn't regrow properly once the bad tooth was removed. She needed bone grafts from elsewhere in her mouth, and a good 9 months to properly fill in so the implant could be set in place. She wore a retaining plate with a fake tooth for better than a year (and that tooth broke very easily; several repairs were needed). She hated the retainer greatly, yet being a professonal who deals with the public (Pharmacist) she couldn't really go without a replacement. (the gap toothed hillbilly look is frowned upon).
But now that the replacement is in, she's good to go. Can't tell the difference between the new tooth and the surrounding old ones.
I joked with her dentist that when the archaeolgists dig up her bones in 2000 years that they'll be able to say that she must have dated from the early 21st century, with the titanium screwed implant. He got a kick out of that.
The insurance was basically worthless; they paid $300 for the removal of the bad tooth, and nothing else. "Cosmetic" work, they said. Well, WTF? Why else are we paying their sorry asses, but for tooth repair/replacement? It's not as if she smoked and wanted them to pay for tooth whitening. Or got involved in bar brawling. She'd be out of a job lickety split if she sported the hillbilly look.