Stimulating gums leads to redness and swelling of gums.
Bleeding tendency
Shrinkage, etc.
Periodontitis causes gingival atrophy on the basis of gingivitis.
The most important thing is alveolar bone absorption.
Dental activity
Fall off, etc.
There are many kinds of toothache. Spontaneous pain refers to persistent pain without stimulation (pulpitis requires root canal treatment). Stimulating pain refers to pain caused by cold, heat, acid and sweetness, which disappears after stimulation (generally, deep caries will develop into pulpitis if not diagnosed and treated).
Percussion pain refers to pain caused by eating hard objects or tapping (periapical periodontitis or periodontitis is felt).
Your expression is the difference between periodontitis and periapical periodontitis. If the teeth you describe used to have nocturnal or spontaneous pain, and now only have percussion pain, then the probability of periapical periodontitis is higher.
The specific situation should go to a regular dental clinic for examination.