What does this mean?
Saliva is mostly water; the rest is a mix of proteins and minerals that keeps the surfaces of your mouth slippery. When the amount produced drops, that mix stays where it is but there is less water in it. What follows is saliva that thickens before the mouth feels dry: a consistency that sticks to the lip, draws out in threads when you pull it apart and leaves a whitish froth at the corners of the mouth.
That is what sets this symptom apart from a feeling of dryness; the change in consistency most often comes earlier. You may not feel thirsty at all; instead you notice your tongue sticking to the roof of your mouth as you talk, or that you cannot swallow dry bread without water. It is also different from a blocked salivary gland: here there is no swelling, it does not come and go with meals, it involves both sides and it carries on all day. The common reasons are not disease in the glands themselves but medicines you take, breathing through your mouth, being short of fluid, and smoking.
Saliva does more than wet the mouth. It buffers the acid that forms after a meal, washes away debris and carries calcium and phosphate to the tooth surface. When the flow drops, all three of those jobs weaken at once. That is why thickened saliva raises the risk of decay without causing any pain; new decay can appear quickly, particularly at the gum margin and on exposed root surfaces. Oral thrush, a change in taste and, for denture wearers, a loss of grip can come up on the same ground.
Thickened saliva is not the sign of one single illness; anything that reduces the flow produces a similar consistency. The headings below show the possibilities that are worked through, starting with medicines and habits.
Likely causes
What helps at home?
- Spread your water through the day; frequent small sips keep the surfaces of your mouth moist for longer than drinking a lot at once.
- Do not try to relieve the dryness with sugary or acidic drinks; when saliva is scarce, fruit juice and fizzy drinks sipped often wear the enamel down quickly.
- Stop using mouthwashes that contain alcohol; they give a brief freshness and then leave the lining of your mouth drier than before.
- Make a list of every medicine you take and bring it to the examination; medicines that cause dryness are common, but do not stop any of them on your own.
- If the dry mouth comes with a gritty soreness in your eyes, as though sand had got in
- If it has gone on for more than three months and has been getting worse
- If white patches that wipe off have appeared on your tongue or cheek, or you have burning, or cracks at the corners of your lips
- If you have noticed several new cavities within a few months, or chipping at the edges of your fillings
- If a swelling has appeared under your jaw or in front of your ear, or pus is coming into your mouth
Frequently asked questions
- I drink plenty of water, so why does it not go away?
- Water wets the mouth for a while, but it does not stand in for saliva. Buffering acid, cleaning and carrying minerals to the teeth do not come from the water in saliva; they come from the proteins and minerals in it. So although drinking water can make the consistency feel better, the low flow underneath carries on. If it does not settle over several weeks, the reason for it needs looking into.
- Could it be because of my medicines?
- The groups of medicines that reduce saliva flow are quite wide; blood pressure, allergy, depression, bladder and pain medicines all include ones with this effect. Taking several of them together can make the effect more noticeable. Even so, do not stop any medicine on your own; the doctor who prescribed it can weigh up a change of dose or an alternative.
- My mouth does not feel dry, my saliva is just thick. Does it still matter?
- It does, because the change in consistency can come before any feeling of dryness. There is no pain or obvious discomfort at this stage, so it can be overlooked for years. Yet the rise in the risk of decay begins here. Planning preventive care early may save a large number of teeth from needing work later on.
This content is for general information and does not replace an in-person examination. Symptoms overlap between conditions, and a diagnosis can only be made clinically.