re: Best Teeth whitening product?Update page 2

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You shouldnt need pain relief to whiten your teeth.

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People have varying degrees of sensitivity when then whiten their teeth. It depends upon how much exposed dentin you have and generally how sensitive they are to normal things like a cold drink etc.

When female patients ask if it hurts to bleach their teeth, I normally look at what shoes they are wearing. High heels = no it doesn't hurt.
Flats = you'll have some transient sensitivity.

Generally works in my practice.