Summarize the following:
If you're not adverse to using your nails and teeth as tools, you may be able to use them to push back (or carefully nibble away) some of the wood of your pencil. Once you've revealed enough of the graphite to begin working again, consider honing it to a tip using some of our other suggestions. Be very careful not to swallow any of the wood shavings. You also want to avoid ingesting the graphite—not because it's toxic like old lead pencils were—but just because it's gross! You also don't want to discolor your teeth.

Summary:
Use your nails and teeth.