However, based on some knowledge of how the metal detectors work - it will all depend on how high their sensitivity is set, how many piercings you have and the size of the titanium things (not sure what to call them?) that you have.
If you are worried about setting of the alarms and having to be screened and the attention it might bring it's probably best to leave them out for the day
You will pass through no probelm ~ My mum has a titanium rod in her hip. We have just returned home from Paris and there was no problem. Never had any problem with her going through to the US either. I have a titanium bar in my belly button and I had no bother either.