I've had about8 or 9 in all the first lasted 3 months the second lasted 6 months the 3 rd About 9 months the next 2 about 1 yr but The last one was not as dramatic result only 2 month & I want to say I was never pain free but it was very manageable without any pain meds as far as pain in the procedure it is a uncomfortable shot BUT I really believe it is All in the Dr that dose it As far as the procedure pain & the results My Dr is extremely fast & very precise The best !