Before:
The upper right first premolar (on the left of the photo), the lower right first molar (on the left of the photo) and the lower left second molar (on the right of the photo) had a poor prognosis due to root canal failure and were extracted.

After:
The upper right first premolar (on the left of the photo), the lower right first molar (on the left of the photo) and the lower left second molar (on the right of the photo) were replaced with implants and restored by the prosthodontist with implant-supported crowns.