How long does internal bleaching last?

We had internal bleaching which lasts for a year up to 5 years, it is not a set time unfortunately, and if your root canal is well done, you can redo internal bleaching if you feel the color is coming back, and that depends on the extent of access opening of tooth, the composite placement and many other factors!

Internal bleaching usually will last a year or slightly longer. If you want a long term fix, then a veneer or crown is your best bet.