These days it seems everyone wants the perfect Hollywood smile. Helen Garston looks at the safest and most effective ways to whiten your teeth. Maybe it’s our constant exposure to American TV and actors with their oh-so pearly whites, or maybe it’s Simon’s Cowell’s perfect smile, but teeth whitening is becoming increasingly popular in this country. More than 100,000 Brits have tried some form of tooth whitening from toothpastes to laser treatments. But is the demand for beautiful ivories as safe and effective as the adverts and brochures claim? Actually, it’s better news than you might think. According to the General Dental…