Missing tooth cn be replaced with the help of bridge or a implant which ever u select.u hv not specified which tooth is missing n details.the tooth which has cavity can be filled provided it's not troubling u with pain and it not deep, which can only be confirmed after a clinical visit.to replace the missing tooth,near by front and back teeths support is taken,for that the nearby teeth are reduced n size.if u dont want to go for bridge and trimming of the nearby teeth u cn go for implant. Implant can range from 20-50k And bridge can range from 15-30 depending on the material of cap u select.

First,u need to get the intraoral x ray done as it will give us an idea of how deep is cavity if it has gone upto the nerve ,then u will have to get Root canal procedure of that tooth to save it . Secondly give me the details of missing tooth i.e its location,condition or otherwise just send me a picture of it.Thirdly there are so many materials and techinuqes of fixing teeth in dentistry so its difficult to give u the idea of budget.

Cavity filling costs not more dan rs500/-whereas tooth fixation depends on weather u go fr implants or crowns....definitely. Crowns r cheaper dan implants

There are various modalities of teeth replacement like removable dentures or fixed bridges or implants, each has its own advantages and disadvantages of limitations and the associated costs are also different. These costs also depend upon the number of units to be replaced and also which quality of material is being used and also on the experience of the dentist. But first of all, a proper clinical evaluation needs to be done so that the treatment modalities applicable in your case can be ascertained and explained to you in detail before the procedure is started. Please contact your dentist for the same. The correction of the tooth with the cavity will be a Priority before the replacement of the missing teeth is done. Regards.