Suitability depends on having enough healthy jawbone to hold the implant, healthy gums, and general health that supports healing.
Implants can fail, and the risk is higher in people who smoke, have uncontrolled diabetes, have untreated gum disease, or take certain medications, particularly some bone medications. Grinding and clenching also place additional load on an implant.
Where bone volume is insufficient, grafting may make treatment possible.
This is why assessment for dental implants in Sydney involves X-rays and a review of your medical history and medications, not just a look at the gap.
If implants are not appropriate, a bridge or a partial denture may achieve a similar result.