While it may take time to simply adjust to the new dentures, it is likely that if teeth were removed the same day that the dentures were given to you, then you will need follow up with your denturist to assure that they continue to fit properly as you heal. If you did not have any teeth extracted and simply had new dentures made, there should be fewer adjustments. These adjustments should be more minor in nature. The heavy feeling may be because you have not previously worn dentures or partial dentures. If that is the case, it will take several weeks to completely adapt to the feel of them.