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Note: because orthodontists generally don't treat patients with active disease, no evidence currently exists from controlled studies and randomized controlled clinical trials, which shows that orthodontic treatment improves or aggravates the status of periodontally compromised dentitions [link]

However there is some evidence that periodontal health increases, on average, during clear aligner treatment [link]. This is probably because patients are much more aware of their oral hygiene and are brushing regularly between meals.

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