How many times would you return a dental bridge to lab for corrections before having it redone?

I had a porcleain dental bridge done and within three weeks a piece broke off. Dentist redid it and now this one doesn't fit right and causing pain. I have been wearing it with temporary cement and dentist has done adjustments on it and sent it to lab for adjustments five times. This has been going on for months now and still in pain. I know he doesn't want to redo again but it still isn't right. I have had a bridge before with no problems. How many adjustments should be done before redoing?

No doctor answers yet