Teeth whiteners and mouth cancer

Hey guys,
I had the habit of using tooth whiteners regularly. But, I came to read an article which states that the continuous usage of teeth whiteners can cause oral cancer. I am worried and am in a confusion on how to whiten my teeth again. I am planning to have a teeth whitening procedure from a dentist ( http://dentalcaretoronto.com/ ) in East York.
Are these results permanent? Do they have any side effects? Please give some genuine replies and suggestions. Thanks in advance.