Mouth acids can do much damage to teeth. Learn how to neutralise them for a healthy mouth.Rinsing your mouth with bicarbonate of soda and water is an excellent method for neutralising the acids in your mouth that are responsible for most dental disease. Fill a bottle of water with a tablespoon of baking soda in the morning and use this to rinse your mouth throughout the day and between meals. Make a new batch every day. This is also great for mouth ulcers and sore throats.