Tooth bleaching is generally pretty cheap, safe method and effective cosmetic treatment. Unlike from a whitheningtoothpaste such as denevit only remove stains, make a tooth whitening teeth really white. A typical tooth whitening lasts 5-10 years depending on if, for example is snus users, smokers or drink red wine, tea or coffee. The use of whitening toothpaste can significantly prolong the result.
If you have dental fillings of composite or porcelain, the match is usually the color you have ever had before bleaching. After whitening your teeth become white, but the fillings, do not change color. You may need to replace your fillings after you have bleached your teeth. This also applies to porcelain crowns and dentures. You should have repaired your hole before you whiten your teeth. Bleaching agent can otherwise seep into the voids and create infection and tooth pain. The result is also better if you remove any calculus before whitening.
If you have sensitive teeth or gum disease should avoid teeth whitening. Some people experience extreme pain when they do tandbleknig or when they get bleach on the gums. If you are pregnant or breastfeeding, you should also avoid tooth whitening, then there are no studies on it's dangerous or not.
It is important to know that not all bleaching methods give the same results.