Is it safe?

Due to changes in the law in October 2012 tooth whitening products with a percentage of hydrogen peroxide between 0.1%-6% can now only be provided by dentists. Tooth whitening is perfectly safe; however you may experience some sensitivity during treatment.

Can I still have tooth whitening at my beautician or hairdressers?

Any beauticians or hairdressers offering tooth whitening will be doing so at a much lower percentage of hydrogen peroxide which means results will be limited. If your beautician or hairdresser is still using a higher percentage of hydrogen peroxide this would be a breach of the regulations that came into effect in October 2012 and therefore a criminal offence.

http://legislation.data.gov.uk/uksi/2012/2263/made/data.htm?wrap=true