Hi Paree,
Our beautiful calico coloured cat Katie was a semi feral when we trapped her. Her microchip details helped to reveal that she had been living rough for at least 6 years. Her mouth was in a poor state as shehad calicivirus.
She had been losing weight as she could not eat properly and her gums were badly inflamed. We tried a course of virbagen Omega but that didn't help (5 doses with one injection every 2 days). The vet had suggested that test results had shown no more than a 50% success ratio in cats using this method but we had to give her that chance.
Eventually her teeth were removed. That was about 2 years ago and,touch wood, she is doing well. The vet may recommend an oral hygiene mouth rinse to use in order to keep any future mouth problems away or to reduce them.