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Before approving a new drug, the FDA typically requires companies to conduct a type of study called a randomized controlled trial, in which study participants are allocated by chance to groups that either receive the drug, or are administered a placebo
In the end, whitening does not mean health
Tsiasioti A et al
Conservative recommendation: Manufacturers and clinics typically recommend 28-30 days because it balances safety (bacterial growth risk) with peptide stability
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