What do systematic reviews say?

Clear aligners (Invisalign / thermoformed aligners) vs Fixed appliances

Aligners may reduce pocket depth compared with fixed appliances in adults at 6-12 weeks (MD -0.42 mm, 95% CI -0.71 to -0.12; very low certainty).

• Impact of Aligners and Fixed Appliances on Oral Health during Orthodontic Treatment: A Systematic Review and… 2021 All outcomes

  6 to 12 weeks · Adults
  MD -0.42 [-0.71, -0.12]
  2 studies · 62 participants
  Very low