Difference between Methamphetamine and Prescribed ADHD medication Adderal Amphetamines?

1) What are the long term affects of Methamphetamine versus those of ADHD Amphetamine?

2) Will prescription Amphetamines cause de-calcification of bones or teeth?

3) Would Methamphetamine have less destructive long term physical affects if it were pharmaceutical grade opposed to street-grade?
I am curious because I have a prescription of Adderall.

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