Repeating whitening without knowing which of these is driving the discolouration usually wastes the treatment. Yellowing after whitening almost always traces back to one of these eight causes: diet, tobacco, hygiene, ageing, stain type, natural tooth colour, restorations, or aftercare. Learn More: https://studiodentalenp.blogspot.com/2026/08/why-your-teeth-keep-turning-yellow.html
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