Is a 7 tooth zirconia bridge risky? I do not want implants or root canals.

After many quotes the best permanent solution is a zirconia bridge with 1,5 and 6 supporting the missing 2,3,4,7. The dentist does emax but chose zirconia for strength Is a 7 tooth bridge hard to maintain & will it fail more quickly than a 3 tooth bridge? If the bridge fails, seems i would have a huge expense to replace or end up with partial dentures. With this solution, I would have only 5 natural teeth remaining on top without crowns or bridges.