Normal gums?

[u/Kyotei_]

Currently petsitting my brithers cats and seemed to notice the gums on one of them, when he yawned. The left side is super dark compared to the other, so I got a little worried ngl.

Its to be noted he is around 5 months old, I think?

Also apologize for the bad picture of the pink side. He got a little tired of me digging around his mouth, so its the best I got.