Tendons and connective tissure have the ability to strengthen and grow over time. If not, then no one would ever recover from a tendon injury. It is a very slow and gradual process, but a process nonetheless. Take glucosamine/chondroitin/msm for extra support. If using AAS and/or constant lifting, once you have an injury to a ligament or tendon, it can take years to recover fully. Don't expect your tendons to be much stronger after a few months of bench press.