I noticed today when I was giving the younger of our two cats (Lollipop) his daily rubdown/health check (he's an indoor/outdoor cat and I worry about ticks, etc) that the front lower part of his gums are a little red. When I pushed gently on the tooth in the middle of the red part, it gave way a little. I unfortunately do not have the money to take him to the vet right now as both my husband and myself are unemployed, so I'm wondering what I should be watching for/worried about--is there anything I can do?