I've had my all on 4 upper and lower for two and a half months.I didn't notice till now but I've noticed in the last week or so. . It seems unstable it seems like one side wants to tilt or give more than the other on the upper.i'm not due for x-rays for another month and a half but I think I should go in and let them check it. Has anyone noticed that in the healing stages that has happened?it doesn't feel loose.. Just when I go to bite sometimes I feel it want to give a little on one side. Thanks all!!!