Cola may quickly lower pH inside orthodontic clear aligners and shift oral bacteria within hours

Study: Cola Exposure Rapidly Lowers pH Inside Clear Aligners and Shifts Oral Bacteria Within Hours

Researchers have discovered that consuming cola while wearing clear orthodontic aligners causes rapid chemical changes inside the aligners, including immediate pH reduction and significant alterations to the bacterial microbiome on the inner surfaces of the devices, according to findings from a recent 24-hour study.

The research highlights important practical considerations for individuals undergoing orthodontic treatment with clear aligners, a popular alternative to traditional metal braces. Clear aligners, which include well-known brands like Invisalign, offer aesthetic advantages and are increasingly chosen by patients who prefer less visible orthodontic treatment. However, the study reveals that dietary choices can have significant biochemical consequences for those wearing these devices.

The pH reduction observed in the study indicates that cola exposure creates an acidic environment inside the aligner. This acidic environment can potentially damage tooth enamel and create conditions favorable for bacterial growth and dental disease. The acidic conditions persist on the inner surfaces of the aligners even after the beverage has been consumed, potentially causing prolonged exposure of teeth to harmful acids.

The microbiome disruption documented in the research suggests that cola exposure significantly alters the bacterial populations that normally colonize the oral cavity and tooth surfaces. While some bacteria are beneficial components of oral health, others contribute to tooth decay and gum disease. The study found that the greatest microbiome disruption occurred when patients removed their aligners before consuming cola and then reinserted them afterward, rather than keeping the aligners in place while drinking.

This finding presents a practical dilemma for aligner-wearers. While removing aligners before consuming acidic beverages appears to be less disruptive to the oral microbiome according to the study, the acidic environment still persists inside the aligner afterward. The researchers themselves acknowledged that the mechanism underlying these microbiome changes requires further investigation before definitive clinical recommendations can be established.

The implications for orthodontic patients are significant. Individuals wearing clear aligners may need to reconsider their beverage consumption habits or accept the potential consequences of continued cola intake. More conservative approaches might include removing aligners before drinking cola and thoroughly rinsing both the mouth and the aligners afterward, though the study suggests such measures may not fully prevent microbiome disruption.

The research underscores the importance of understanding how daily habits and dietary choices interact with orthodontic devices. As clear aligners continue to grow in popularity, additional research exploring the effects of various beverages and foods on aligner chemistry and oral health will likely inform better patient guidance and potentially improve long-term outcomes of orthodontic treatment.