Fluoride is a beneficial part of your oral health. It can help with sensitivity as well as re-mineralize tooth enamel. It is found in tap water if the area you live in has fluoridated water and is not filtered. It is also found in most toothpastes and mouth rinses. You can also get fluoride varnish treatment at the dentist when you go in for your routine cleaning. This will give you an extra boost of fluoride because the concentration is higher than in toothpastes and mouthwashes. When using fluoridated toothpaste, spit the puddle out of your mouth when done brushing and leave residue of toothpaste on teeth for at least 30 minutes. This allows the fluoride to sit on your teeth and have the most valuable outcome especially at night. Same with the mouth rinse. Just swish for 1 minute and leave for 30 minutes. If you floss after doing this, you can push the fluoride up in-between the teeth and help to re-mineralize tooth enamel. This can help to keep cavities from progressing and getting worse and hopefully prevent you from having fillings done.