Is It Normal to Not Be Able to Bite Down Completely when Just Starting Invisalign?

If you just started Invisalign your bite is going to feel very different every time you take them out. As you move forward with treatment you will also notice that some teeth are touching and some don't. As teeth move your bite will change, but it will feel completely normal once you have finished with treatment. I will advice you to let your dentist know if your bite does not feel right 2 months after completing your Invisalign. If the trays are making your tongue, lips or cheeks sore, go to your dentist, there are tools to smooth down the aligners without breaking them. Do not try this at home, is a fast an easy procedure to do with no cost to you.

Yes, it is normal not to be able to bite down with your trays in place. Basically, you will not have a stable bite until you are finished with the treatment as your bite will be changing with each tray.

 

When you say you can't bite down all the way, I assume you mean with the trays in place because the aligners could not change your bite appreciably in just one day.  This is normal, because the trays cover the biting surfaces of your teeth.  Later on, after you've had a number of trays, you may find that you can't bite down all the way with the trays off, and this is also common.  As your teeth move your bite changes and there may be a stage where they do not meet fully.  However, the treatment is designed to establish a good bite in the end.  Regarding the irritation on your tongue ... your doctor should be able to smooth that for you.