Part of tooth came away

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Hopefully there’s someone who can advise...
Just eating my lunch and part of a tooth has come away. The area I’ve circled it’s one side of the base of a tooth that’s visible. When I run my tongue along it I can feel the gap, doesn’t feel sensitive atm.
I haven’t actually been to the dentist in years as I’ve always been really anxious about it. What should I do 😭

You’re going to have to get a dental opinion on this, don’t leave it.

Sounds like it could be some calculus that's broken off on the back on your teeth rather than actual tooth? That's the most common place it builds up