Neem (also known as nimm in Punjabi) is most useful herb on this planet. I am from Punjab and we still have so many nimm trees in our farms. And I used to eat neem / nimm fruit also know as namolian every day during their season and I used to clean my teeth with the neem / nimm wood every day. Never had any teeth issues or parasites issues until I moved here in the US. Well, taking / consuming nimm (leaves, oil, juice, fruit etc.) in a small amount is recommended unless other wise you know what ghee (clarified butter) is and add 2-3 tbs of ghee in your every day diet (lunch, dinner etc.). Punjabi people add ghee in their daily diet every day and that could be the reason that why it never bothered me but, if you do not eat ghee and over use the nimm then it can effect your eyes and some other internal parts as well. Yeah, you can consume it in any form (eat fruit, eat leaves, oil, juice etc.) but do not over dose.