Your teeth usually start out perfect with nice white teeth due to a fresh enamel surface. This tooth enamel is designed to help protect your teeth from years of chewing, gnashing and attacks from the acidic nature of some foods. Over the years, this enamel gets worn down and permits the tooth’s core material called, which is yellow, to show through.
It is during all the years of chewing and abuse that millions of microscopic cracks start to appear in the enamel. These cracks over time fill with debris and stains from drinking dark liquids and smoking. Its from these effects that teeth develop a dull yellow discoloring.
When you use a teeth whitening procedure, it removes these stains and debris. This in turn leaves the enamel cracks open. While some of the cracks get re-mineralized with your saliva, others will eventually refill with debris and need to be whitened again in the future.
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