I've recently been obsessing over my teeth. I went to the dentist about 7 months ago and he said everything looked good. But in the last month I've had two little chips in different teeth and am now worried that my gums are receeding. They look healthy and feel fine. I take pretty good care of them, too but there's a few that just seem like they aren't tight to the tooth. They can move back a little when I touch them. I have an appointment in a month but I am wondering can my teeth change so drastically that my dentist would have seen no signs?