Anti-Snoring Device Side Effects: What to Know Before You Start

The 5 Most Common MAD Side Effects and Their Causes

Mandibular advancement devices work by holding the lower jaw in a slightly forward position throughout the night. That mechanical repositioning is effective at opening the airway, but it also places the temporomandibular joint (TMJ), the muscles of mastication, and the teeth in an unaccustomed position for seven or eight hours. The five side effects reported most frequently in clinical studies are: jaw muscle soreness, excessive salivation, tooth tenderness or pressure, dry mouth, and temporary bite changes upon waking. According to research published in PubMed, the majority of these effects are transient and resolve within the first two to four weeks as the body adapts. Knowing what to expect — and why each effect occurs — makes the adaptation period much easier to navigate.

Jaw Soreness and the Adaptation Timeline

Jaw soreness is reported by roughly 30 to 40 percent of new MAD users during the first week of use. The soreness originates in the masseter and pterygoid muscles, which must maintain the jaw in a held-forward position rather than relaxing completely during sleep. Think of it as similar to muscle fatigue after an unfamiliar workout: the discomfort signals that muscles are adapting, not that damage is occurring.

The adaptation timeline follows a predictable pattern for most users. Soreness is typically most pronounced during the first three to five days, begins to ease by days seven to ten, and is largely resolved by the end of the third week. You can accelerate the process by starting at the minimum effective advancement setting and increasing gradually — the Snorple mouthpiece's adjustable mechanism is specifically designed for this graduated approach. Morning jaw exercises (gentle opening and closing, side-to-side movements) for two to three minutes after removing the device also help restore normal muscle resting tone and significantly reduce residual soreness. If soreness is severe or involves sharp pain in the joint rather than muscle fatigue, reduce the advancement setting before progressing further.

Excess Salivation in the First Two Weeks

Many new MAD users are surprised to wake up with noticeably more saliva than usual, sometimes enough to dampen the pillow. This is a normal and temporary physiological response. When a foreign object is placed in the mouth — even a well-fitted custom appliance — the brain's salivary centers interpret it as a potential food item and increase salivation reflexively. This is the same mechanism responsible for the mouth watering when you smell food.

Hypersalivation from a new mouthpiece typically peaks during the first week and resolves almost entirely by the end of the second. The brain's habituation circuits learn that the device is not food and downregulate salivary output accordingly. There is nothing you need to do to treat this side effect other than be patient and keep a spare pillowcase handy for the first week. If excess salivation persists beyond three to four weeks, it may indicate that the device fit is triggering a gag reflex — in that case, a refitting or tongue advancement adjustment is worth considering. The American Dental Association notes that proper appliance fit is the single most important factor in reducing adaptation side effects.

Tooth Tenderness and How to Minimize It

Tooth tenderness, particularly in the front lower teeth, occurs because the MAD distributes the holding force across the dental arches. The teeth used as anchor points for the device experience mild but unfamiliar pressure throughout the night. Most users describe this as a low-level aching or sensitivity in the morning that fades within 20 to 30 minutes of removing the device.

Several strategies reliably reduce tooth tenderness. First, ensure the bite impression was captured accurately during fitting — an imprecise fit concentrates pressure unevenly. Second, avoid grinding or clenching the appliance when inserting or removing it; let the thermoplastic seat passively. Third, perform morning bite re-alignment exercises: after removing the device, place your back teeth together gently and hold for a few seconds, repeating several times. This helps the TMJ and dental ligaments return to their normal daytime position more quickly. If you already have dental crowns, bridges, implants, or significant periodontal disease, consult your dentist before starting MAD therapy, as these conditions may require a professionally fitted custom appliance rather than an over-the-counter device.

When to Contact the Manufacturer vs a Dentist

Most side effects from MAD therapy are adaptation effects and can be managed by the user without professional input. Contact the device manufacturer or retailer when: the physical device is damaged, cracked, or has lost its shape; the fit has changed and the appliance is no longer seating properly; or you are having trouble with the adjustment mechanism. Reputable companies like Snorple offer direct support and, within the guarantee period, replacement options for defective devices.

Contact a dentist or sleep medicine physician when you experience: sharp, localized joint pain rather than diffuse muscle soreness; pain that worsens rather than improves over the first two weeks; a persistent bite change that does not resolve within 30 minutes of your morning exercises; or any new clicking, locking, or grinding sensation in the temporomandibular joint. These signs can indicate that the advancement setting is too aggressive for your particular anatomy, that you have an underlying TMJ disorder that needs evaluation before continuing MAD therapy, or — rarely — that MAD therapy is not the right modality for you. The Sleep Foundation emphasizes that properly supervised MAD use produces serious adverse events in fewer than five percent of users, and most of those are resolved by adjusting the advancement level rather than discontinuing treatment.