Powerful machines used by beauty salons to fight fat and the effects of age should be subject to legal restrictions, the council said. Spokesman Dr Michael Tsui said machines generating lasers, ultrasound and suction power were a matter of 'grave concern', as there were no laws governing how they were used or who used them. He said medical advisers had raised doubts over claims that fat could be burned, muscles toned and skin tissue strengthened with the machines. So far this year, 123 salon clients have complained such treatments had proved useless. A government spokeswoman said the use of lasers in the beauty industry had been monitored and found to be safe.