She is light salmon with a dark salmon dorsal fin. She wears a light blue shirt, light blue skirt, and a white undershirt.
SpongeBob and Patrick enter Dr. Gill's Office, she greets SpongeBob by saying, "Hello! And who are you, young man?". Patrick then tells SpongeBob that he thought that everyone here knew him. SpongeBob says that she must be new.
When it is Patrick's turn to get his teeth cleaned, Dr. Gill tells his receptionist to cancel his appointments for the rest of the day.
The next day, Patrick tells SpongeBob that Dr. Gill's receptionist called him and told him that he doesn't have any cavities.
SpongeBob then gets a call from Dr. Gill's office, it is most likely her. She tells him to come in at 2:00 PM that afternoon to fix some cavities that they found. SpongeBob says that he will come in.
When SpongeBob comes in for his follow-up, Dr. Gill notices that it is Patrick's x-ray, not SpongeBob's. He then says that his new receptionist must have mixed up the x-rays.
She then appears at the end of the book. SpongeBob and Patrick watch her put a paper tooth on the No Cavi-Tree.