Naptime is suddenly play time

My son is suddenly refusing to nap. This is 2 days in a row. I am heading to the dentist and he is going to be with my mom. I don't want him to be fussy for her. Anyone have any tips? I believe that he is teething.

About Kathy
Birth: January 09
On since: Apr 22, 2014
Mom of 2 angels due to miscarriage. I have my miracle James. I want to have another baby. I stay at home during the week and work for Gymboree Play and Music on the weekends.