It is quite normal for the necks of the teeth to stay slightly yellow, mosts dentists try to make patients aware of this potential risk. 20 cups of tea is a large amount to drink! You will need regular maintenance with custom made trays to help prolong the effect of the whitening.
Without this and with continued tea, I'd expect your "normal" tooth colour to return in about 3 months. It is not normal to whiten molars when undertaking power whitening treatment. I personally do not undertake power whitening as I have better and more stable results using other systems.
I am sorry you o not have the result you wanted.
I hope this answers your questions
Kindest regards
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