Attempting to determine someone's use of meth based upon stereotypical physical characteristics is as useless as was doing the same to determine someone's HIV status back in the 90's and 2000's.
A former friend is a meth addict. He does not have any wasting, has good teeth, and is a very muscular man. He was also arrested for trespassing and prowling on a neighbor's property when Ambien caused him to sleepwalk and look into and try the doors of a neighbor's home and the meth made him get belligerent to a San Diego police officer. Two other former friends had round faces, were somewhat overweight, and were regular meth users.
Behavioral characteristics are a better barometer of usage than physical appearance.