As Vastness have explain amphetamine and methamphetamine have different out comes in the brain. Yes, just an addition of a methyl group to the nitrogen can have a drastic different effect and changes in interaction with the brain receptors.
Also amphetamines variations in salts and isomers used in the pill if you buy it generic Adderall. Sometimes I get "amphetamines salts" containing an ration of 1:1 of the two isomers. While in other refills I get "dextroamphetamine" that is more likely to have an isomers composition as adderall (I really don't have the data available). Even this change in isomers have different effects on the brain, amphetamine salts give me an very milder stimulation in comparison to dextroamphetamine and I can even say that is more useful for recreational use more that functional use. Dextroamphetamine is more stimulant and you can really feel more focus that with amphetamines salts, excellent for functional use.
Methamphetamine have also two isomers that are like amphetamine, dextromethamphetamine is stronger that levomethamphetamine. Methamphetamine is a neurotoxin because it make the dopamine receptor to literally burst out all the dopamine at ounce, damaging the receptor over the time. Some say is reversible some say it doesn't. If you don't wish to have changes in your brain that maybe permanent do it very infrequently in the year.
Now on the effects on your teeth, there some factors that affect your teeth are the chemicals used for the making of mistress Tina, can be very corrosive if you expose your teeth with vapors, you can reduce this by really suck on that glass dick and put the mouth piece the more near at the back of your mouth. I got a real good bubbler that is very big, like really big with a big bulb, making it more suitable for preventing come in contact with your teeth. Btw her name is Sublime and she is a big girl, the most enjoyable feature is that with an candle I can have a free hand for for putting my finger on the hole concentrating the vapors and because she is big I can concentrate a lot a lot of vapors and better visibility and space to move the methamphetamine oil. Anyways I got derail, back to the point, brush your teeth often especially if you are on a binge and have been all night awake. Methamphetamine (an many other drugs) cause dry mouth, tho is kinda more severe that with amphetamines and other substances. I read somewhere but not sure if is true that methamphetamine contract the veins in the saliva glands. I use dry mouth wash that are formulated to hydrate your mouth. Also lots of water and don't eat sugary foods and drink while been high. Teeth grinding happens in both amphetamines and methamphetamine but in methamphetamine is more acute. I mentally trained my self to not do it, went I use either of the two I use a month guard that prevents grinding went you sleep.
Don't pick your skin, don't try to get rid of your acne, you will be an representation of many faces of meth. I don't do anything to my skin until I am sober. Psychosis is something that is inevitable if you don't sleep for more that two days, have poor eating habits or not eat at all and drink very little water. Soon you will experience a tweaker psychosis that you will wish your never come across The Mistress and Shadow People will hunt you. How to prevent this? Sleep every two days more than 6 hours and if you can do it sleep all the night and have good nutritious meals for recharge on energy and vitamins necessary for the healthy function of the brain and body. It doesn't matter if I do amphetamine or methamphetamine I always get hungry (with meth I get hungrier that amphetamine) you should learn how to do this or obligate yourself to eat, nutrient shakes are a good option to have in your refrigerator alone side water that have electrolyte add. Now I know that you maybe will not used it infrequently in the year so I will tell your a secret I found in my research in neurotoxicity and possibly neuroprotective for reduced the damage. I found that Selenium is a great neuroprotector, I pop a pill or two before I vaporize from Sublime and take one every day if I extended the use to the other day and after I stop I take it for three more days, this is not clinically proven but is better to be very careful after all I almost finished my batchelor at chemistry but at the middle of it I change to political science, I need a healthy brain. Another neuroprotector I found is lithium carbonate, and casually I got a prescription for it before I started methamphetamine. I know it might be difficult to get some lithium carbonate but I have read rumors that some vitamin shop have some supplement with another salt of lithium that maybe will not hurt to look for it.
Shit this is a ******** long post but I try to resume all I know about it. Now I want to put a shard in Sublime and vaporize because repeatedly writing methamphetamine give me some kind of stupid craving.
Be safe and specially have fun!