Why does brushing teeth make me gag and vomit?

Frenal appendices or tags are generally innocuous and usually don’t need any other treatment. But if they cause discomfort or pain, it is recommended that you see a dentist of an oral surgeon for further examination and possible removal.

Drinking mouthwash by accident brings conce­rn. Chlorhexidine is strong; it may cause stomach pain, nause­a, and dizziness. These e­ffects could go away alone. Drink lots of water to dilute­ mouthwash. But if unwell or your issues continue, se­ek medical care.

A toothache can occur when your tooth has a problem. The sensitivity or pain you feel when drinking water may be a cavity or dental caries. This can bring discomfort and at the same time make your tooth sensitive to extreme-temperature liquids. Advising patients to visit a dentist as soon as possible is beneficial to help manage toothache. They can investigate the tooth and give proper solutions which might involve filling the cavity or other pain relief procedures to improve the situation.

In a situation where your gums are receding, you must visit a periodontist to discover the leading cause of the problem. After solving the main cause, your doctor may discuss implants as a solution for you. 

There is a chance that the solid, round, and movable object under your lower jaw in the lower part of molar teeth may be due to salivary gland stone or lymph node. But it need physical examination to determine the actual cause.

We need to know which teeth and the location of the teeth for examining and the previous history. Your query is too short to answer