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This is the most effective and long term whitening option available as it is a slightly slower and more long-lasting effect.
It is also a more suitable option for people that suffer from sensitive teeth as a lower strength gel is used in the mouthguard provided.
Teeth whitening treatments can have long-lasting effects if the teeth are properly maintained afterwards.
Teeth whitening will not make your teeth stain resistant to things like tea, coffee, or smoking so care should be taken after treatment to maintain your whiter smile for longer.