1, first prepare the fluoride and fluoridation equipment, such as syringes, droppers, etc., pour out the yogurt in the fried yogurt machine, clean it and make sure it is dry.

2. Secondly, add the fluoride into the fluoridation equipment, insert the fluoridation equipment into the air inlet of the yogurt maker, and slowly inject the fluoride.

3, and then pay attention to control the amount of fluoride, do not overdo it, so as not to affect the normal operation of the machine, after adding the fluoride, the fluoride equipment will be taken out, let the machine run on its own for a period of time, so that the fluoride is fully distributed.

4. Finally, clean the fried yogurt machine with water to ensure that no fluoride residue is left.