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Do yellow teeth mean I have cavities?

My teeth have yellowed over the past years. Does that mean they're weaker or have cavities? I don't have dental insurance and have tried to keep them as healthy as possible.
Discoloration of the teeth does not necessarily mean that you have a cavity. Are your teeth hurting you? Are they sensitive to hot and cold drinks or to sugary drinks and foods? I understand that you don't have dental insurance, but to be on the safe side you need to get them checked out by a dentist who will examine your teeth visually and also with an instrument that can detect if there is decay. Many people have discolorations on their teeth that may or may not be a cavity. Tooth discoloration is usually caused by extrinsic stains. Extrinsic stains are defined as stains located on the outer surface of the tooth structure and caused by extrinsic agents, such as food stains that darken with time, tea, coffee, tobacco, wine, chromogenic bacteria, and metals, etc. There are certain factors that predispose children and adults to extrinsic stains, including enamel defects, salivary dysfunction, poor oral hygiene, etc. Diminished salivary output also contributes to extrinsic discoloration because it may be caused by local disease, systemic disease, and multiple medications. Other chemical ingredients, such as cetylpyridinium chloride in several mouthwashes, can also induce dental discolorations. Again, please discuss with a dentist.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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