Most likely nothing: Chemicals in the pen are too weak. You may have to use this otc device daily for months.! do a web search for 'kor whitening'... It is pricey but results are great.
Answered 12/5/2013
4.7k views
4 doctors weighed in across 2 answers
4 doctors weighed in across 2 answers
3 doctors weighed in across 3 answers
5 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question