More info needed: There is so many possible answer to this question, they are: 1)gingivitis (gum inflammation), 2) occlusion (an underbite patient), 3) trauma due to brushing with hard/medium tooth brush, 4) dry mouth or sjogren syndrome 5) rampant decay in lower front teeth... Schedule an exam with your dentist. More information needed prior to make a definitive diagnosis.
Answered 9/20/2022
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