There is no required explanation for why it has been a while. Work, family, cost, fear, health changes, and difficult past experiences can all interrupt dental care. The useful place to begin is with what you need now.
When you contact the office, share the immediate concern and anything that would make the visit easier. You can ask for extra explanation, a slower pace, or time to discuss costs and options before treatment.
The first appointment is used to understand your concerns and current oral health. The dentist may recommend an examination and X-rays when clinically appropriate. You can ask why each step is recommended before deciding whether to proceed.
A treatment discussion should separate urgent needs from care that can be planned over time. Ask what was found, what the options are, what could happen if an item is delayed, and what each stage is expected to cost. You remain part of every decision.
If pain or swelling is the reason you are returning, call the office rather than waiting for an online reply. The team can discuss the concern and the next available emergency appointment.