Hello, Thanks for your query. According to your explanation it seems that your having gingival recession. It is a condition characterized by exposure of root of teeth caused by loss of gum tissue and retraction of the gingival margin from the crown of the tooth. It can occur due to many reasons like tooth brush trauma , gingivitis, periodontal inflamation, trauma,tooth crowding, eating disorders. I suggest you to visit dentist to rule out the exact cause. Get the scaling done , maintain oral hygiene , use softer toothbrush,prevent food retention,use antiseptic mouthwash, massage on gingiva with stolin gum paint twice a day. I do hope that you have found something helpful and I will be glad to answer any further query. Take care