article_snippet.sent: Hydrogen peroxide gel is then squirted on to a special tray via a syringe, and the tray fitted over her teeth and left for 45 minutes.
article_snippet.sent: Usually, the first treatment is carried out at the surgery, then the patient is given syringes and the tray to use at home — 45 minutes a day, for a fortnight, being the norm.
article_snippet.sent: After 45 minutes out of the syringe, hydrogen peroxide loses effectiveness.
article_snippet.sent: By the time Teresa had reached Teresa last syringe, Teresa was bleaching for up to four hours at a time.
article_snippet.sent: Lisa (pictured) buys £50 boxes of syringes of a 25 per cent solution from the U.S and insists Lisa has no pain or side effects from the treatment .
article_snippet.sent: Donna ( buys £50 boxes of syringes of a 25 per cent solution from the U.S., yet insists Donna ( has no side-effects other than sensitive teeth.