I'm now over a month since I had it done and my teeth are extremely sensitive

Based on overall positive reviews I decided to have Zoom teeth whitening. The only major side effect I've been reading about was "some" teeth sensitivity after which should subside with time. I'm now over a month since I had it done and my teeth are extremely sensitive not just on certain hot/cold foods or drinks but just in general. It is like I am always "aware" of my teeth. On top of that the results were very modest while my teeth got a little whiter, it wasn't a dramatic result in any way that I hoped for. I would absolutely NOT recommend.