The claim
A teeth whitening serum can effectively whiten yellow teeth
PeakMetrics research summary
Based on related reporting.
Research from related reporting describes a Good Housekeeping Beauty Lab test in which Crest’s whitening serum lightened teeth nearly three shades in two weeks. The reporting also notes that whitening results vary, so this supports the claim that a serum can work but does not establish that every serum will effectively whiten yellow teeth.[S3]
Research date:
Sources and attribution
- [original] The Healthy Indian Project original review
Original review · Retrieved October 17, 2026
- [S3] These teeth whitening actually work, according to 150 testers
Additional research · Retrieved October 17, 2026