Do it yourself is not a smart choice

Home teeth whitening treatments Young women are putting their health at risk by using do-it-yourself (DIY) teeth-whitening treatments involving baking soda, ash and hydrogen peroxide, dentists warn.
A growing number of websites are promoting at-home techniques, which can cause permanent damage to tooth enamel and gums.
The DIY treatments are being posted on the internet by ordinary members of the public — often teenagers.
Some wrongly advise brushing teeth with soap, salt, baking soda and even the bleach hydrogen peroxide as a cheaper alternative to having them professionally whitened. Dentists warn that some of the DIY treatments can dissolve the enamel of the teeth.
The popularity of teeth-whitening has increased tenfold in the past five years and at least 100,000 people have some form of treatment each year.
Laser teeth-whitening costs as much as £1,300 (Dh7,691) and although professional bleaching is much cheaper, patients can still expect to pay between £500 and £700 (Dh2,957 and Dh4,140).
There are also cheaper whitening gels and "deep clean" toothbrushes available from pharmacists for up to £100 (Dh591), although these are not deemed effective.
Professor Anthony Eder, clinical director of the London Tooth Wear Centre, said: "There seems to be a growing concern among teens about their teeth and the internet offers many whitening recipes. Some of these have the potential to damage healthy teeth.
The problem
"Household baking soda is an abrasive. Salt crystals will scratch the enamel. Any treatment involving acid is harmful."
Dr Stuart Johnston of the British Dental Association said: "The hard tissue of the teeth requires strong chemicals to whiten it that are only safe for use by properly trained clinicians.
"Trying to use recipes for whitening from the internet isn't a good idea. Also, having problems repaired by a dentist after attempts at self-whitening could cost many times more."