Any sensitivity caused by whitening is reversible. If you purchase products on line you take the risk of not having the procedure monitored by a dentist and you won't know if the product is genuine or a cheaper import.
I hope this helps
Kindest regards
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Dr Pav Khaira - Award winning dentist
UK & European Pioneer of the 3 Month Brace
Special interest in all forms of fast braces and advanced cosmetic solutions
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