You have to correct the damage first Brushing can nothing to do with already formed cavity
Brushing just help to keep tooth cleaned
If you start with pain or sensitivity better to do root canal If no symptom some time you can save tooth with just filling
But anyway some type of treatment required.
Brushing properly will not provide any cure to the decay which is done. Once a tooth is going for root canal then better get it done. As root canal is internal clearance of bacteria inside tooth. Brushing is just external cleaning of teeth.
Cavity has already reached a place where teeth it's on the nerves already .. if the situation is left the infection may reach your bonemail and then pus may ooze out of your gums .. before situation gets a little tensed ... or worst kindly get root canal done
Yes it will increase,,and after few days it will decay the teeth completely
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