I didn’t have any buccal tissue harvested, so I can’t speak from personal experience, but my surgeon very thoroughly explained a lot of it, and I’ve talked to people that have dealt with it.
Did they put stitches in your mouth? When they do it tends to stay tight a bit longer. Regardless of whether they did or not, it’s usually recommended that you work on stretching your cheek out, and over time it should regain much of its elasticity. The numbness should also go away in time, but both of them can take several months in some cases.
There very well could be some permanent damage as well. Its not uncommon for some tightness and numbness to remain indefinitely, but most of it should go away. Although it probably doesn’t feel like it, you’re still early in the recovery phase. A lot of tissue takes over a year to fully heal, and nerves can take even longer. Just hang in there.
Clayton