Gain without Pain?

The bleach usually hurts, like a little hammer hitting against the front of your tooth. Now, there's nothing. As cosmetic-dentistry-as-metaphor-for-life suggests, can there be enlightening without twinge? Gain without pain. Does this lead me to suspect the bleach is no longer working?
Can I no longer trust my procedures will have any incremental effect. Have I gone as white as I can?

Whatever, I have two tubes left.

Debbie can not understand what 'this is all about'. She simply 'doesn't get it'.
Please see www.debbiekruger.com