Advair Linked To Loss Of Tooth Enamel

I am a 37 yr old while female - I have been on Advair for about the last 5/6 years - I dont have any of the symtoms that everyone has stated above - but I have something that nobody else has seemed to mention. Before I started using Advair - I had perfect teeth - no cavitites no nothing. After years of using Advair - I now have Tooth Enamel Loss on my bottom front teeth - they are not decaying at all but the lower half of each tooth has lost its tooth enamel and shows the yellowish Dentin layer. I use my Advair 250/50 once a day and rinse my mouth with water as well as mouth wash and brushing after each dose - but yet it is still destroyin my teeth. I have contacted the maker of Advair in regards to this and get no response what so ever - so should my next step be to contact a lawyer? Any advice would be greatly appreciated