Coffee, soft drinks & co: How beverages affect your teeth and your microbiome

Coffee, cola, energy drinks – popular classics with side effects

For many, a coffee in the morning is just as essential as a smoothie after sports or an energy drink during long workdays.

But what many don't know: Almost all of these drinks affect the sensitive pH level in the mouth – often in a way that can damage our teeth and our microbiome in the long term.

Our mouth is a finely tuned ecosystem.

Saliva normally keeps the pH level in the neutral range (around pH 7.0) and protects our teeth through its natural buffering effect.

However, as soon as we consume beverages with a low pH value, this balance changes dramatically – often faster than we think.

The underestimated danger: The pH level in the mouth

To understand how drinks affect our dental health, it's worth taking a look at their pH values:

•          Coffee has a pH of around 5.0 – so it's already quite acidic.

•          Carbonated water fluctuates between pH 3.0 and 4.0.

•          Apple spritzer has a pH of approximately 3.0–3.5.

•          Diet Coke and many energy drinks reach extremely acidic pH values ​​of 2.5–3.0.

•          Even smoothies, although seemingly healthy, can be harmful to tooth enamel with a pH of 3.0–4.0.

As soon as the pH level in the mouth drops below about 5.5, the tooth enamel – the hardest substance in the human body – begins to lose minerals such as calcium and phosphate.

This process is called demineralization and makes teeth more susceptible to cavities, sensitivity and tooth fractures in the long term.

The structure of our teeth and their weak points

The outer layer of the tooth consists of enamel, which is made up of crystalline hydroxyapatite – a material that is extremely resistant to pressure but susceptible to acids.

Beneath this lies the softer dentin, which can be exposed when enamel is lost and reacts painfully to stimuli such as cold or sweets.

Inside is the pulp with nerves and blood vessels – the most sensitive part of the tooth.

Damaging acids first reach the enamel and, with frequent, unprotected consumption of acidic drinks, can slowly penetrate into the dentin.

Saliva: More than just moisture

Our saliva plays a key role in maintaining healthy teeth and microbiome.

It acts like a natural buffer, neutralizing acids and shifting the pH value back towards neutral.

In addition, it provides minerals such as calcium and phosphate, which help to repair minor enamel damage – a process known as remineralization.

Saliva also contains enzymes and immune substances that keep harmful bacteria in check and stabilize the microbiome.

A dry mouth – whether caused by dehydration, stress or medication – can significantly weaken this protective function.

Brushing your teeth: Before or after coffee?

One of the most frequently asked questions:

Should you brush your teeth before or after coffee (or cola, smoothie)?

The clear answer is: Before!

After consuming acidic drinks, tooth enamel is temporarily softer.

Brushing your teeth directly at this moment would not only remove plaque, but also mechanically damage the attacked enamel.

It is better to thoroughly clean your teeth before drinking to reduce existing plaque and bacteria.

After consumption, rinsing the mouth with water or chewing sugar-free gum is sufficient to stimulate saliva production.

Only after about 30 minutes has the saliva neutralized the acid and remineralization begun – then it is safe to brush your teeth again.

Conclusion: Protection begins with small habits.

If you want to maintain healthy teeth and a stable oral microbiome in the long term, it's worth being more mindful of your consumption of acidic drinks.

Your saliva, your enamel and your microbiome will thank you – with a healthy, radiant smile.