By the tops, do you mean near the gum level (cervical level)?
Or do you mean the tips (incisal edges) of your teeth?
Do you have pics of your teeth to show us?
The "tops" or incisal edges will whiten more easily than the gum margin areas because of the thinner structure. I had an assistant dentist once who bleached her teeth continually for several weeks (even taking painkillers) and could never whiten the gum margins to her satisfaction.
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