After a Tummy Tuck incision is healed, can it reopen?

Unfortunately, you are not quite out of the woods yet.  Three and a half weeks is certainly pretty good, but wounds can come apart of "dehisce" even at a late stage, so I wouldn't necessarily bank on scar being durable yet.  Of course, with every passing day, you get a little more healed, but I wouldn't go doing any back bends just now - if you know what I mean.  At six weeks I would certainly feel better about it, but in the world of surgery, many strange things are possible - so even then I would take it easy.Not sure about the tape because I don't use it in my practice.  I would check with your surgeon.Good Luck!

Make an appointment with your plastic surgeon's office right away. They need to hear about any discomfort or unusual healing immediately.