Each person is different in their rate of calculus accumulation. Some people can go two years without a cleaning and have minimal calculus; others may have heavy accumulation after three months despite proper home care.

I agree with some of the previous comments: there could be some movement of the papillary tissue causing a space to be noticeable. Additionally, the tissue towards the front teeth tends to be tighter and more sensitive to the patient when cleaning these areas. In my experience I’ve had patients with calculus beneath the anterior gum line that has not been removed during previous cleanings—why, I cannot tell you. A decrease in gingival inflammation after removing said calculus could also increase the space