If you have a cracked or chipped tooth in your denture, you'll need to visit your dentist or send the denture to a dental laboratory yourself to get the tooth repaired. If, however, one of the teeth falls out of your denture and the tooth is totally intact, you can repair the denture yourself by gluing it back into the denture. According to Denturemedic.com, you must beware of using glues that aren't made for dentures or using some of the denture glues touted by various companies on the Internet because these can heat up and melt your dentures as well as discolour them.
Rinse your denture under warm running tap water.
Brush the remaining glue off the denture with a toothbrush. Rub gently back and forth in the area where the tooth is missing to loosen and pull off the remaining glue. If you can't get it all with the toothbrush, try to pick it off with your fingernail. Be careful not to scratch the denture.
Squeeze the denture acrylic (available through your dentist or an online dental lab) onto the denture where the tooth came out. Cover the entire space with the acrylic. Do not put the acrylic directly on the tooth.
Place the tooth back in the denture, being careful to place it properly and securely. Make sure the tooth is not turned crooked.
Hold the tooth in the denture for two minutes with your thumb on one side and your index finger on the other.
Clean any excess denture acrylic off the denture with a soft cloth, being careful not to touch the tooth.
Let the denture sit for three hours to make sure the tooth is securely bonded to the denture before you eat on it.