The best replacement for fess is balloon sinuplasty.

The best alternatives to fess are rated as following:
★★★★★  balloon sinuplasty
★  septoplasty
★  balloon
★  lieutenant iresso

Your alternative for fess is not listed? Suggest!
Speaking about fess, one probably shouldn't forget about septoplasty.

Other search terms related to fess and their ratings are:
★★★★★ septoplasty
★★★ polypectomy
You have in mind a companion for fess and it is not yet here? Propose!



Google Trends

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fess
balloon sinuplasty
septoplasty