Hello The irritation might be due to the reaction to the filling, but it will subside with in few days Please visit the dentist if there is any pain, swelling, or sensitivity on the area of filling

Based on your description, this does not sound concerning at present. Since there is no pain, no sensitivity, and you are able to eat normally, the tooth itself is likely fine. A burning or irritated sensation around a recent filling and on the lips can sometimes occur due to minor soft-tissue irritation, dryness, or a temporary reaction to dental materials used during the procedure. This can appear a few days after treatment and usually settles on its own. I would suggest avoiding very spicy or hot foods for a few days, keeping the area clean, and staying well hydrated. If the burning sensation persists beyond a week, worsens, or if pain or sensitivity develops, you should revisit your dentist for a review. At this stage, there is no immediate cause for worry.

Was it silver filling or tooth coloured filling ? If silver filling can be allergic to the contents inside hence these symptoms If tooth coloured filling and then too there is irritation wait for 2 weeks post the filling done or else see the dentists after that Get an Xray done

Please do share the type of the filling which has been done and do share the x-ray if possible

From your symptoms it looks  like it's a amalgam restoration and it's delayed type 4 hypersensitivity Do check any inflamed  or burning areas nearby the filling  like cheek or gum and any type of metallic taste....

Hello. Which material filling was done? Need to know that first

It's quite necessary in your case to understand the filling material first . Is it a silver colour filling or tooth colour filling.

I can't understand your definition of burning irritation but not pain or sensitivity.which filling is this,Gic,amalgam or composite?.since it is deep you may experience sensitivity

Hello, After a deep filling, burning or tingling can occur due to temporary nerve or soft-tissue irritation, even without pain or sensitivity. This usually settles on its own. If the filling is silver amalgam, a true mercury allergy is very rare. When it does occur, it typically causes persistent burning, redness, ulcers, or a metallic taste in areas touching the filling and does not improve on its own. For now, avoid very spicy or acidic foods and maintain good oral hygiene. If symptoms persist beyond 1–2 weeks, worsen, or sores appear, a clinical evaluation is advised.