fillings between crown and gumline: Is it good idea ?

[unique123]

I have crown in my front teeth.There's a missing tooth between my crown.I have separated gum in the area of the missing tooth because i wasn't stiched my gum when I was kid.Now I'm 25. I have crown in two of my front tooth including one between the two 1 year ago.Now, The gum has receaded in the area of missing tooth and there is a visible hool and I feel discomfort. The dentist told me to tolerate it which I can't do.He also said that the crown needs to be removed and recemented but renoving crown may break my original tooth.so,Is it good idea to put fillingngs between the crown and the gum for natural looks ? Or It will create further infections or pain or gum disease ? Is there's any other option?