The first thing to do is talk to your dentist about the possible risks of undergoing a teeth whitening treatment. The most common risks that can occur with whitening tooth is tooth sensitivity, which can range from moderate to severe. Your dentist may be able to predict whether you will have any problems during the process and give you solution. To alleviate the sensitivity you may recommend certain analgesics and / or creams dental designed to treat the teeth sensitive.
Why change color and teeth darker or turn yellow
The inner portion of the teeth often darken over time, also some habits like smoking, drinking tea, coffee or red wine can produce unwanted coloration. Some medications like tetracycline can also cause discoloration of the teeth.
The whitening treatment is successful in 90% of cases. The yellow teeth get good results with bleaching, while the teeth with brown colors are not as responsive. Teeth with gray colors because of tetracycline or fluorosis (excessive intake of fluoride) is not likely to change dramatically in color.
Note: if you have fillings, veneers or crowns placed on the front teeth, the bleach does not affect the color of these materials, and they will not match the color of the newly whitened teeth. In these cases it will be necessary to change and correct restorations and the new color of your teeth.