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If a salon gives you the bleaching gel to self-administer whilst they are there, it is still illegal as they are not registered, dental professionals.
Teeth whitening products offered but not administered correctly are breaking the law, such as with the case against Megawhite in 2014.
Maintaining Results
Whichever method you decide to use, you should take care of your newly whitened teeth afterwards.
Avoid substances that can stain your teeth such as tea, coffee and red wine. Always brush your teeth twice a day using fluoride toothpaste.
Most importantly, talk to your dentist as their knowledge and expertise can help you to get the results you desire.