The pain is short and sharp as you'll find they'll pierce it very quickly, you'll barely notice it! The thing that i found most uncomfortable is the swelling afterwards, came up around 6 or so hours after and my tongue had swollen up to the entire size of the bar by the first evening. It was never really painful, just a dull throb for the first couple of days. It was also a pest when i was trying to eat, i lived on soups and yoghurts until the swelling had gone down! Also until you're used to it, prob about a week, the bar will feel absolutely HUGE! Go for it as chances are you'll love it, just be prepared for it to take a bit of getting used to! x