Kindly get scaling done and use a gum paint twice daily for 15 days. Kindly get the caries removed and get the cavity filled with a tooth coloured restoration. Brush your teeth twice daily using correct brushing technique to maintain your oral hygiene.
Thanks for the query
There is nothing called as home remedy once tooth has a cavity, it has to be cleaned and filled with restorative material by your dentist.
For pain you can take any painkiller which suits you or you can do warm saline gargles.
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