Is it safe to bleach your teeth? What about laser bleach? How much does it cost? Is 20 years old enough?

I've used Crest White Strips maybe twice already. They were pretty good but I had extremely yellow teeth. Now they are slightly worse than normal but my back teeth are still nasty. I know there are $200 gels but I'm not sure if it will give all my teeth the same tone of white.

Is it safe to bleach your teeth? What about laser bleach? How much does it cost? Is 20 years old enough?
I have been using peroxide on my teeth since my teenage years. The reason being, I had cancers and my dentist advised me to rinse with peroxide. My teeth are very white and I know alot of whiteners contain peroxide.



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