How bad is it to purge once or twice a month

i used to have anorexia about 5 years ago and now I go though periods where I purge. its never more than 1000 calories once or twice a month.

i sort of don't think its a big deal to throw up once a month, can't be doing that much damage to your teeth, be that harmful to your health can it?

most people my age throw up was more than once a month from drinking ...

is there anyone with a medical background who has any advice?
How bad is it to purge once or twice a month
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