charitable trust registered under section 12AA of Income tax

PRADIP Banaye (18 Points)

18 October 2017  
Dear sirs/ madam,
we supply artificial teeth to Dental charitable trust, who are registers under section 12A of Income tax act 1961. so can we make them exempted invoice ?????? and also note that they are charging to patients for artificial teeth.

please advice shall we give them exempted invoice or GST invoice.

thanks