Whenever I hit the brake, my front brakes make this high pitched noise

Hi, I have been having this problem since the last year. Whenever I hit the brake, my front brakes make this high pitched noise. (When I tried to stop the car using the emergency brake, it doesn't make that noise so that I am assuming front brakes are the on that make noise) It makes noise more often during summer than spring or fall when it rains. I took it to the shop the other day and they told me that my brakes are fine, and I should just live with this noise until my brakes are worn out. I was so desperate to fix this problem and I almost started thinking that I should take my car to the dealer: I have been taking my car to this shop for 3 yrs now so that I trust their judgment, but I keep thinking that how am I going to drive while hearing this irritating noise especially when summer is near. Please let me know if theres anything I can do.