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Diphenhydramine is generic benadryl and this is acceptable for use in canines for various problems. However, I am not completely sure about it's use in wolves.
Also, you need to keep in mind that this is going to relax him a LITTLE, but it will not knock him out or make him sleep long enough to do this.
You would be much better served with a medication like acepromazine or another type of sedative that will relax the dog and make it easier.
Most loose teeth will come out on their own if left alone. You can also try a piece of meat or a chew rope. You hold one end and pull the other when it's in the mouth.
Let me know if you still have questions.