about dextrose versus carb powder

[newrob]

is it okay to use dextrose in pre and post-workout drinks. is it safe (i know that it is sugar derived from corn). will it harm my teeth?
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i've been using carb powder but my trainer has switched me to dextrose. he feels that i'm getting enough complex carbs in my diet so the dextrose is used as a high glycemic boost before and recovery after supplement. opinions? please email me privately. thanks.