If you are missing one or more teeth, you'll want replacements that are as natural as possible.  If dentures don't work for you, you may consider dental implants.  Unlike dentures, which can be removed, implants are permanently anchored into the jaw itself.

You are a good candidate for implants if you have jawbone ridges that are in good shape and healthy oral tissues.  When the implant device is inserted into the jaw, a chemical  and mechanical bond is formed. The jawbone actually grows into the implant.

With implants, you get a perfect fit, and they will look and feel as good as (or better than!) your original teeth.

The above photo also includes the use of a good example of permanently implanting  a synthetic tooth to fill a gap  Additionally, as you can see, tooth-colored fillings can substantially improve the beauty of your teeth.