In February 2016, I got my crown/bridge over 4 implants and 2 missing teeth in the middle on my upper teeth. Part of the crown/bridge is closed that can't be flossed/cleaned. This also causes bleeding and sore on the gum tissue. What is the best way to solve the problem with the least complications: removing/redoing the crown or gingivectomy surgery? Thanks so much in advance for your professional advice!