My daughter has broken her second NHS retainer after finishing orthodontic treatment after having them for a month (when these were replaced the orthodontist suspected that the first pair she had fitted had hairline cracks in them when she was given them). The ones she has seem very rigid with no give at all and have lasted 3 weeks before splitting at the back of each jaw . She has to wear them 24/7 for the next 12 months which means taking them in and out to eat drink, brush teeth etc and I'm just not sure they’re up to the job as she is quite a careful girl. A friend suggested that maybe she grinds her teeth at night which I don't think she does but it is possible. They cost £80 to replace which is fine but not if they are only going to last a month. Has anyone else had this problem and is it possible to buy different, stronger types of retainers maybe from an NHS or private dentist that might actually last a bit longer. Thanks.