Varies: It could be a few days to a week.
Answered 12/6/2016
978 views
Discontinue: The only way to find out is to discontinue use of the product. Once you're feeling better, make an appointment with your Dentist to discuss safe, effective whitening systems. OtC products are not very effective, and as you have found out not safe for everyone.
Answered 12/6/2016
978 views
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