What do systematic reviews say?

CP gel in tray vs HP gel in tray

• Home‐based chemically‐induced whitening (bleaching) of teeth in adults 2018 · Cochrane All outcomes
  No difference between HP and CP in tray groups in tooth sensitivity and oral irritation
  3 studies
  GRADE not reported

HP strips vs HP strips

• Home‐based chemically‐induced whitening (bleaching) of teeth in adults 2018 · Cochrane All outcomes
  Very thin gel had less tooth sensitivity than thicker gel despite higher HP; not significant
  2 studies
  GRADE not reported

SPC paint-on gel vs HP paint-on gel

• Home‐based chemically‐induced whitening (bleaching) of teeth in adults 2018 · Cochrane All outcomes
  Tooth sensitivity in one subject from both groups; one subject in 19% SPC reported oral sensitivity; all mild (Gerlach 2003)
  1 study
  GRADE not reported

STPP chewing gum vs placebo

The review found no eligible studies for this question.

• Home‐based chemically‐induced whitening (bleaching) of teeth in adults 2018 · Cochrane All outcomes
  Not reported
  Studies not reported
  No studies found

Macrolides vs tetracycline

The review found no eligible studies for this question.

• Head‐to‐head oral prophylactic antibiotic therapy for chronic obstructive pulmonary disease 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Quinolone vs tetracycline

The review found no eligible studies for this question.

• Head‐to‐head oral prophylactic antibiotic therapy for chronic obstructive pulmonary disease 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found