The problem could be due to your toothpaste; if you are using a gel, this occurs most probably. As you mentioned, cracking of lips (if that's the case) is due to dehydration.
Next Steps
Switch to a milder toothpaste. Drink atleast 3 litres of water everyday.
Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
Tooth and Mouth
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