Coffee and tea stains add up, but whitening gels offer a gradual, reliable fix....

https://bizzmarkblog.com/the-truth-about-whitening-how-to-brighten-your-smile-without-the-nerve-wracking-sensitivity/

Coffee and tea stains add up, but whitening gels offer a gradual, reliable fix. I tested the latest formulas to see which brighten your smile without damaging your enamel or causing sensitivity. It’s about consistency, not miracles