Question about bad teeth

ill start by saying I don't know if this person has dental insurance and even if they did they wouldn't go to the dentist.

when I first met him I noticed a chipped rotting tooth, as time went on I noticed more rotting teeth and the two front ones are turning dark yellow starting from the gum line.

i think theyre getting worse and the teeth smell bad. they kind of give off a rotten egg smell when he opens his mouth.

i also noticed his fingers and hands were black with dirt.

could this be from bad hygiene?

drug use? if so what kind?

Question about bad teeth
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