Define Tier increase. Looks cap at 5 and if I recall correctly, until you drop below 3, you should be okay. So, as you pointed out, use the cream as needed and be sure to shower regularly.
no I meant how many points to hit each tier like 5 uses of cream needed to get to tier 2 (level 2 of looks) Ten needed for tier 3? Etc... All other stats have their point requirements in the FAQ except looks