Hi Implants do have good success rate provided they are done properly. However you r too young, it will be better if you upload an xray of your teeth . In certain cases even severely decayed teeth can be saved with a root canal and cap.

Hello, Please share what problem are you having in teeth for which you want an extraction because the treatment depends upon the problem like if you have not painful cavity it can be restored , or RCT can be done.. There are lot of options to save the tooth. As you stated that you 15 years you still in your teeth development stage and molars eruption will be taking place. As for implants you your cbct, your bone space and few other factors determine how your implant will be

Hello U r too young to go for extraction . Kindly forward concern  and problems in detail.which tooth U want to for extraction.  Get an x ray done and upload it so that we can  guide  u accordingly.  If it can be saved by rct it will be better .