I had a filling put in yesterday. I received novocaine, but now the right side of my tongue is still slightly numb. Should I be worried that it is not going to go away?

Was it your lower jaw? Sometimes it takes the anesthetic a while to wear off, but if it's the next day, I'd call the dentist and ask what's going on.

The same thing happened to my son just yesterday.
how is your tongue now?
do you have the filling back?

It has now been nearly 3 months and I have just started to really get the feeling back in my tongue. For a few days I had a really metallic taste on the side of my tongue that has been numb. But I had done some other reading that indicated that if the shot was given right into the nerve core, that it could take a few months for it to wear off. So my tongue is almost completely back to normal, but not quite 100% yet. I was amazed at how long it took for the feeling to begin to come back. I hope your son gets the feeling back sooner than I did.