Color of bottom gums seem to become less pink, should i be concerned?

Examination: Any change should be evaluated. Have your dentist check and, if necessary, refer you to a periodontist.

Gum are pink ; firm: Your lower gums should be the same color as your upper gums. If they are "less pink" then what you are possibly saying its that they are more red. Redness can be a sign of gingivitis or other periodontal inflammation issues. Don't run off to your dentist without at least trying this: floss your teeth daily and use vibratory brushing technique at your gum-tooth interface. No stroking motions!