it is 恒牙. The baby tooth needs to be pulled off.My child experienced the same at the very beginning of age five.
My dentist is on 261 Montreal Road. He is a very nice old man. Not sure if it's convenient for you. Also not sure if he is accepting new patient. His name is Dr. Thibault. Phone number is 7412444.
My son is not 6 yet and is getting all his molar teeth. I am kind of worried.