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Movable Vs Static Sex Doll Jaw: The Pros And Cons Compared
When two otherwise identical dolls are in front of you and you have to decide, the jaw suddenly becomes essential; most buyers don't think about it before that. Movable jaws, which go by the names ROS jaw and hinged jaw too, let the mouth open and close. Static or fixed jaws leave the mouth permanently closed. Each has uses, so the right choice is whichever matches what you in fact want from the doll.
 
The Case for a Fixed Jaw
With a fixed jaw, as the name proposes, the mouth is sculpted closed and stays that way permanently. Locked in place, the expression means the doll invariably looks the same way whatever the pose, mood or context. Most customers find this perfectly fine, as the closed-mouth expression is normally the most natural and good-looking one in any case. A calm closed mouth can convey confidence, approachability or serenity, depending on the sculpt, with no change needed.
 
A Functional Opening
A movable jaw opens the mouth and closes it, which makes a much wider range of expressions. Flexibility is the draw: surprised, aroused, mid-speech, or mid-anything else you can picture, which suits photography and roleplay. Small mechanisms, usually hidden in the neck or the back of the head, are what let the jaw hinge inside the head. A workable opening is what the mouth becomes when it's open, and some purchasers find this more realistic for certain kinds of use.
 
Change the Expression Without Changing the Doll
If you want one reason for a movable jaw, it's expressiveness. A movable jaw gives numerous distinct looks depending on how it's positioned, where a closed mouth can only ever look one way. Huge for photography, this lets you change the expression between shots without changing the doll. For roleplay, it adds a layer of realism that a static jaw can't match, because the mouth actually opens and closes rather than staying fixed.
 
Advantage Two: Workable Realism
Advantage number two is practical realism. Intimate use of the mouth is where a movable jaw is honestly more realistic than a static one, opening and closing like the genuine thing. More detail is typically sculpted into the mouth interior on movable-jaw dolls, as it's designed to be seen, which makes the tongue and teeth more prominent. Know this if oral use is a priority; otherwise it may not matter to you at all.
 
Lifelike in Photos and in Person
There's a third benefit in more natural looks for certain poses with a movable jaw. Take a doll lying down: a closed mouth can look somewhat stiff, while an open mouth looks more calm and natural. Open mouths look more lifelike than closed ones in certain sitting or reclining poses as well. This is one of the reasons photographers tend to prefer movable-jaw dolls: the effect is subtle but apparent in photos and in person.
 
When the Open Mouth Looks Unnatural
A movable jaw changes the facial structure, which is its first disadvantage. When the jaw opens, the cheeks pull back, the chin drops, the nose angle shifts, and she no longer looks like her closed-mouth photos. A subtle difference, with the open mouth still looking natural, is what you get in some dolls. Other dolls look less appealing with an open mouth that appears exaggerated or unnatural than they do closed. Sculpts vary massively on this, and photos of both states are worth seeing before you commit.
 
Problems That Develop Over Time
The second disadvantage is mechanical complexity. More parts, more ways to break and more potential for difficulties over time are what a movable jaw has. The interior of the mouth can be harder to clean, the jaw can become misaligned, and the hinge mechanism can loosen. Never developing a jaw-related difficulty, a static jaw has none of these issues, which, though not dealbreakers, are worth knowing about.
 
Spending the Savings Where It Matters
The third drawback is cost. Though usually modest, the amount a movable jaw adds to the cost is a premium that not every purchaser wants to pay. When you're not going to use the mouth and the closed-mouth expression suits you, you're wasting money on the extra cost of a movable jaw. The same goes if money is tight and you'd rather spend on a better skeleton or wig, both arguably more vital to the overall experience.
 
Dry Thoroughly After Every Use
One more downside, the fourth, is that a movable jaw can be harder to clean. More of a trap for moisture and bacteria is the more accessible interior of the mouth, which needs to be dried fully after every use. Simpler to clean, a static mouth has an interior that isn't designed to be accessible, so the cleaning routine is faster and less involved. People who would rather not add to their maintenance routine are best served by a static jaw.
 
Disadvantage Five: Photography Is Harder
The fifth disadvantage is photography. It seems backwards, but photography can be harder with a movable jaw, as the open-mouth expression doesn't invariably match the pose or lighting. Practically anywhere, a closed mouth photographs naturally, whereas an open mouth needs more attentive framing and posing to look right. Not an experienced photographer? A static jaw will give you better results more always than a movable one.
 
Context Changes What Looks Natural
In certain contexts the open mouth can look unnatural, and that's the sixth downside. Odd is how a doll sitting quietly on a shelf with her mouth wide open looks, whereas the same doll with a closed mouth looks composed and natural. A doll that's there to be displayed does better with a static jaw, whose default expression is more suitable than a movable jaw's.
 
It Comes Down to What You Want From the Doll
Decide by asking yourself what you in fact want from the doll. For customers after photography and roleplay with maximum expressiveness, the movable jaw's premium is worth paying. For companionship and intimacy, if the most natural-looking face possible is what you want, a static jaw is usually better. If in doubt, go static: it's cheaper, simpler and can't develop jaw-related problems.
 
Natural by Default, Expressive on Demand
There's also a middle ground that some manufacturers offer, which is a movable jaw that's designed to stay mainly closed. The jaw only opens when you actively open it on these dolls, which have the option to open the mouth but a default position that is closed. You don't have to pick between a natural default look and the ability to be expressive; this gives you the best of both worlds. Ask about this middle ground if you can't pick between the two options.
 
A Reversible Decision With Removable Heads
If one doll comes with either jaw type and nothing else differs, photos of both are the best way to decide. Check the open mouth against the closed one, and decide whether you'd actually use the expression. Save yourself the money and acquire the static version when you can't imagine using the open mouth. When you can, the premium for the movable jaw is worth it. Removable heads make this reversible, since you can invariably acquire a head with the other jaw type later if you change your mind.
 
Silky Operation and Position-Holding
A further question, on quality, is worth raising. Vast variation exists between manufacturers' movable jaws in smoothness of operation and how well they hold their position. Solid movable jaws open smoothly and stay where you put them; bad ones are stiff, awkward and prone to drooping. Considering a movable jaw? Ask the retailer for a video or detailed description of how the mechanism works, and don't be afraid to walk away if the answer isn't reassuring. Research pays off here, given that a badly made movable jaw is a worse proposition than a good static one.
 
Small Gaps Where Moisture and Bacteria Accumulate
The maintenance question deserves some reflection as well. Because the mechanism generates small gaps where moisture and bacteria can accumulate, movable jaws need cleaning more cautiously than static ones. Lax drying of the mouth interior after use can saddle a movable jaw with complications that a static jaw would never have. Honesty is the key: movable jaws needn't be prevented entirely, but you should know whether you'll in fact do the maintenance. The cleaning routine is added to by a movable jaw, which is worth factoring into the decision if you already find it a chore.
 
Expression and Realism vs Simplicity and Cost
At the end of the day, there's no universally better jaw type. Both are valid options, each with a following and each with trade-offs. Expression and practical realism favour movable jaws. Simplicity, lower cost and a reliably natural look favour static jaws. Spec sheets can make one choice sound more impressive, but your choice should rest on how you intend to use the doll. A closed mouth became the default because it works nearly everywhere, suiting the widest range of situations and looking natural in the widest range of poses, so lean on it if you're unsure. More info at this rosslink. Also check out  additional hints (http://forum.exalto-emirates.com/viewtopic.php?f=7&t=245112) for more.