The best replacement for gaps is paleo.

The best alternatives to gaps are rated as following:
★★★★★  paleo
★★★  bed
★★★  scd
★★★  candida diet
★★  body ecology
★★  fodmap
★★  aip
★★  body ecology diet
★★  autoimmune paleo
★  specific carbohydrate diet
★  gfcf
★  perfect health diet
★  fodmaps
  specific carbohydrate
  scd diet
  outliers
  nourishing traditions
  withthigh gaps

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

Other search terms related to gaps and their ratings are:
★★★★★ veneers
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Google Trends

Scale is based on the average worldwide traffic of gaps in all years. Click on graph for more.
gaps
paleo
bed