While diffusion of the bleach into teeth helps in whitening as your tooth dentin is broken up by the hydrogen peroxide bleach, the resultant pressure is irritating to the teeth nerves, which elevates teeth sensitivity. This increases flow of blood and the pressure within the tooth pulp which causes irritation of the pulp (pulpitis).
The bleaching product molecules penetrate into the teeth. Teeth sensitivity occurs after bleaching due to the following reasons: But what causes the pain and how is it managed? However, many people experience teeth sensitivity and pain following the procedure. There are many products available for teeth whitening and the procedure can be done at home or at a dentist’s office. Additionally, the remineralizing effects of these pastes help to improve whitening.If you have stained teeth and you intend to remove the surface stain and discoloration, you may consider teeth whitening. By gently coating your teeth with a product like MI Paste or Colgate’s Pro-Argin Toothpaste, you will plug up open pores on your teeth and reduce sensitivity. Use your finger (or q-tip) to gently apply to your teeth one of the Calcium based desensitizing toothpastes. Let the paste set for a few minutes and then spit thoroughly do not rinse for at least 30 minutes following application. Getting your oral pH back to normal lets your teeth begin to recover. Rinse out your mouth thoroughly after bleaching with water. Although bleaching companies try to make products that are pH balanced, many end up being slightly acidic. Using toothpaste instead of the commercial gels may also be a more cost-friendly method. We are able to prescribe specifically designed desensitizing gels like UltraEZ™, Desensitize!, and Relief™, but in a pinch you can also try using in the trays a desensitizing toothpaste that contains 5% potassium nitrate. 
Ideally, the gel should contain both 5% potassium nitrate and fluoride. For the most relief, you should apply the gel to your teeth for 10 to 30 minutes before bleaching using the same bleaching trays you got from your dentist and rinse afterwards. Use a Desensitizing Gel to calm your the nerves in your teeth prior to whitening.It can also damage your enamel since some bleaching agents are slightly acidic. Brushing right after whitening will further open pores on exposed dentin and create sensitivity. Brush your teeth before whitening not after whitening.
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