Good Morning L., Kids this age it is very normal for them to crunch or grind their teeth. It's something new to them. The biting you can and should stop asap. Say No sternly and remove him from your clothing or shoulder.
He can bite a hole in your clothing or really put a Ouchie on your shoulder or leg. Keep extra teethe rs handy... LOL
A dentist will tell you the same, it's normal and really they won't actually hurt their teeth. Besides that most dentist won't see child under the age of 3, unless it is an emergency situation.
God Bless you, Have a Wonderful Thanksgiving
K. Nana of 5