No, DK Gel should not be used for oral candidiasis or applied on the tongue unless specifically prescribed by a doctor. DK Gel contains miconazole, an antifungal medicine mainly intended for treating fungal infections on the skin, such as athlete’s foot, jock itch, ringworm, and skin candidiasis. Oral candidiasis requires antifungal medicines that are specifically designed and approved for use inside the mouth. Using a skin gel inside the mouth may be unsafe and may not effectively treat the infection. If you have white patches, soreness, burning, or difficulty swallowing due to suspected oral candidiasis, consult a doctor or dentist for the appropriate treatment. This is especially important if you have diabetes, a weakened immune system, or repeated episodes of oral thrush. Do not apply skin antifungal products inside the mouth without medical advice.