Misconception 1: Using too much toothpaste may cause oral cancer
Several active ingredients in toothpaste raise concerns.Sodium lauryl sulfate, a widely used chemical in toothpaste, is believed to potentially cause gastrointestinal disorders and liver toxicity; it may also increase susceptibility to oral ulcers and oral cancer. Abrasives in toothpaste are also thought to damage gums, making them more vulnerable to injury. Therefore, avoid using excessive amounts of toothpaste.
Misconception 2: Improper use of fluoride toothpaste can cause dental fluorosis
The role of fluoride toothpaste in preventing cavities is now widely recognized, and it's often the first product people think of for oral care. However, experts point out that while fluoride toothpaste effectively prevents cavities, it also has side effects. Improper use can lead to dental fluorosis.The line between fluoride's anti-cavity benefits and its toxicity is very narrow. Excessive fluoride intake can cause white spots on teeth, known as dental fluorosis, with children being the most common victims. This is because children often lack full control over swallowing, increasing the chance of accidentally swallowing fluoride toothpaste during brushing and leading to higher fluoride intake.Since toothpaste packaging typically lacks usage instructions, target demographics, or dosage guidelines, it often leads to adults and children sharing the same toothpaste. Additionally, many people follow TV commercials by squeezing an excessive amount of toothpaste onto their brushes. Experts advise consumers to use no more than 1 cm of fluoride toothpaste per application. Children should ideally avoid fluoride toothpaste altogether or use it cautiously under parental supervision.Furthermore, fluoride is a highly toxic substance. Excessive absorption can cause fluorosis. National regulations stipulate that free fluoride in fluoridated toothpaste should range between 400–1200 ppm. Particular caution is needed for children under 3–4 years old, as they may swallow 1/8–1/4 of the toothpaste, making fluoride toothpaste unsuitable for them.
Misconception 3: Foamy toothpaste is unsuitable for children
Foamy toothpaste is not recommended for children. Toothpastes are categorized as high-foam, medium-foam, or low-foam, with foam volume determined by soap content. High-foam toothpastes contain more soap, which can irritate oral mucosa.
Misconception 4: Using the same toothpaste morning and night is detrimental to oral health
Oral health experts recommend alternating toothpaste products according to seasonal changes and physical conditions, rather than consistently using the same brand or functional type. In advanced Western countries, over 80% of consumers use separate toothpaste for morning and nighttime brushing, and they also maintain regular dental check-up habits.Research indicates that most oral issues stem from bacteria. While human saliva naturally possesses antibacterial properties, daytime saliva production is 3-4 times higher than at night, effectively suppressing bacterial growth. During sleep, reduced salivary gland activity leads to oral dryness and acidification, failing to inhibit bacterial proliferation and triggering various oral problems.
Misconception 5: Medicated toothpaste should not be used long-term
Numerous medicated toothpastes—such as desensitizing, anti-inflammatory, deodorizing, and hemostatic varieties—have emerged with extensive advertising. Many people treat these as miracle cures for oral diseases, using them regardless of whether they have dental issues. This practice is inadvisable.Oral bacteria fall into two categories: pathogenic and non-pathogenic. They maintain a delicate "ecological balance" within the mouth through mutual restraint.
Long-term use of medicated toothpaste with strong antibacterial properties not only causes pathogenic bacteria to develop resistance but also suppresses and kills normal oral flora while targeting pathogens. This disrupts the oral "ecological balance," potentially triggering new oral diseases and infections.Additionally, some medicated toothpastes contain alkaloids and highly irritating substances. Prolonged use not only damages the delicate mucous membranes in the mouth but also causes inflammation of the gums, oral cavity, and tongue due to constant irritation, leading to conditions like gingivitis, stomatitis, and glossitis.Individuals with allergic asthma may experience wheezing and gastrointestinal discomfort due to the pungent odor of medicated toothpaste. Some medicated toothpastes also contain dyes that, with prolonged use, can stain tooth surfaces, causing loss of luster and affecting dental aesthetics.
For individuals with oral health issues, alternating between fluoride toothpaste and medicated toothpaste is advisable. For middle-aged and elderly patients with both cavities and periodontal disease, pairing fluoride products with herbal formulations in the morning and evening is recommended. Those experiencing sensitivity to hot or cold temperatures should combine desensitizing anti-acid products with regular fluoride toothpaste.