Urgh.... when I got grommets I was 27 and I had an ear infection start the next day. It was the worst pain, I remember laying in bed crying... I had to have the ear packed and massive amount of antibiotics. Basically, yep the grommets are doing their job, but you still have to be wary, I reckon if the temp doesn't go down in 24 hours, its something you may need antibiotics for.