Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for difficulty breathing or swallowing, rapidly spreading swelling of the face or neck, major facial injury, or bleeding that will not stop.
These are not typical features of uncomplicated bruxism.
Seek urgent dental or medical care for:
Arrange a routine dental appointment if you notice persistent jaw pain, morning headaches, sensitive or worn teeth, broken dental work, or regular grinding sounds during sleep.
A dentist can also assess whether a mouth guard is appropriate.
The article also says
Contact a primary care professional or relevant prescriber if symptoms began after starting or changing a medicine.
Do not stop the medicine on your own.
Ask about a sleep assessment if grinding occurs alongside loud snoring, witnessed breathing pauses, choking during sleep, or marked daytime sleepiness.
These may point to a separate sleep problem that needs assessment.
Every sign above is quoted from the sofidex article on Teeth grinding. If you are not sure, err upward — it is always reasonable to be checked.