What Each Option Actually Involves
A single-tooth implant replaces one missing tooth with a titanium post and a crown, without touching or reshaping the teeth on either side of the gap. A 3-unit bridge replaces one missing tooth too, but it does so by crowning the two healthy teeth next to the gap and connecting all three crowns as a single piece, meaning three teeth are treated to fix a problem with one. That difference, one tooth treated versus three, is the starting point for any honest cost comparison, since it affects both the upfront price and what happens down the line. It also affects the amount of your own natural tooth structure involved: an implant leaves the neighboring teeth completely untouched, while a bridge permanently reshapes them.