Enlighten is a 2 week treatment (for 95% of patients) and guarantees a B1 shade for 98% of cases. Patients are given a treatment kit to take home and apply for 2 weeks every night, followed by a final visit to the dentist at the end of that period.
Professional whitening systems have to be done under the supervision of a dentist in the UK. Enlighten whitening is a treatment, not just a product. That means a dentist is needed to perform the treatment, take your moulds and have your customised whitening trays made. Also, you need a check up before doing the treatment.
Plus UK law prohibits the selling of professional teeth whitening gels directly to the general public because they can only be provided under the supervision of a dentist.