Post-whitening dietary adjustments can help maintain results by avoiding foods and drinks that stain teeth, like coffee, red wine, and berries. Clients should be advised to avoid these for at least 48 hours post-treatment and focus on foods that promote oral health, like crunchy vegetables and dairy products. Recommending dietary practices helps clients protect their whitening results and maintain a bright smile. This guidance is particularly valuable for clients serious about preserving their whitening investment.