Disclaimer: As stated above, this is MY routine and what I USE. These products may cause gum irritation or temporary tooth sensitivity but it was something that I was able to overcome. I've consulted with my dentist about using these products and he gave me the 'okay'. Do your research to find out what whitening products will work for you. If you have really sensitive teeth, use a whitener with less concentration.
Also try to avoid eating/drinking things that might stain your teeth like black tea, coffee, soda pop, etc..
I wouldn't recommend this product to people with sensitive teeth. If the pain continues after use, try brushing your teeth with Sensodyne toothpaste, it helps!
FTC: I purchased everything with my own funds. All opinions expressed are 100% honest and based on my experience.