There are three options to close a gap left by a missing tooth.
Bridges are favourable because they are fixed in your mouth, however they do require the support of adjacent teeth and in order to offer this support, we do shape, and takeaway otherwise healthy tooth structure.
Dentures are much more conservative but they are removable, which some patients may not favour. They will be bale to fill large areas of missing teeth very easily and can be aesthetically pleasing.
Implants, tend to be the most costly, but they are the closest thing to your natural tooth in terms of their functionality. They are fixed, unlike dentures, and do not need the support of adjacent teeth, unlike bridges.
Your dentist will advise you on the best option suited to your mouth and budget.