we had a 2nd lot done in one ear only, after the first lot fell out after 10 months. DS still had a small amount of hearing loss in that ear, so it indicted something was up, and we suspected he was going to end up getting re-occuring ear infections like he did before the grommits. We had them but in before he was sick with a cold again from memory, the hearing loss was enough for us to make the decision, especially as he has other issues with speech etc and it was earlier to eliminate all other factors. The dr said for a kid without the issues my son had he probably wouldn't have redone them with just 10% hearing loss.

This one has lasted around 16 months, and it is just in the process of falling out. I guess I will wait and see what next winter brings to see if we need another set, but I'm happy I did this one.