Your jawbone contains important structures that include nerves, blood vessels, and sinus cavities. Implants must be inserted to avoid these structures as otherwise, they could damage them. If a dental implant is too close to a nerve, it can cause numbness or pain, which in some cases can even be permanent. Your sinus cavities are close to your upper back teeth, where the bone is often substantially thinner. Incorrectly located dental implants can perforate the sinus cavities, which is why it’s often necessary to have a sinus lift when replacing upper back teeth.