LED teeth whitening session and no change. Should i go for another session again?

September 17, 2017
Asked By:BeautyQ in USA

I have completed two sessions of LED whitening for the teeth some months ago. I was instructed to not drink coffee or so for 4 days. However, i was suprised that after just 4-7 days my teeth retained just as yellow as they were before. Is that normal? 

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