I don’t know how this relates to Jesse in the show, but I know a couple of meth users and neither of them have meth mouth. One is my cousin, and she even went to jail for it she was in so deep, but she didn’t really look that bad all things considered. The other guy had the face sores, but seems fine otherwise appearance-wise (really they could pass as bad acne). Both of them were multiple-year users as far as a I know, but both would make pretty terrible candidates for those “Faces of Meth” scare tactic posters. They just looked like normal kids.
Meth CAN really mess up your physical appearance, but I think meth mouth is not something that happens to everyone who uses, especially if they pay any attention to dental hygiene. /anecdote
A point that may be relevant to some of the discussion above, regarding the passage of time in the show (I don’t think it’s a big spoiler, but just in case):
The amount of time elapsed to date is only about a year, as marked by Walt’s birthdays - his 50th in the first episode, his 51st in the 4th episode of the current season.
Ooooooh, yeah. I’m gonna have to go ahead and … disagree with on this one, Bob.
Just got done with season one. Saw so much nonsense I can’t believe this ever made it to a second season.
Example: Meth-head throws out a batch because it isn’t up to his high standards!
Nobody notices when Walt strolls out of school with a butt-load of chemistry supplys that are apparently* so *important they maintain a written inventory! And he doesn’t change the inventory report! (and by the way- 3 respirators were missing, not 2)
Walt and Meth-head just waltz out the door of the chemical supply place with big, giant drum of goodies, while the alarms are going off. And Walt blows up a building and just walks off casually. Does ABQ have any police, other than Walt’s brother-in-law?
Eh, whatever. I’m just not feelin’ it. Totally underwhelmed.