The best way to stop spitting when talking is to speak slowly, pronouncing each word clearly, according to Simple Remedies. Spitting when talking sometimes is caused when people speak too quickly, upsetting the balance of fluids in the mouth and producing excess saliva.
The problem also may be caused by weakened muscles in the mouth, which can be corrected with exercises, Simple Remedies notes.
Another option is to periodically drain the mouth to prevent over-accumulation of saliva by holding ground coffee beans under the tongue, Simple Remedies notes. Cutting back on foods containing a high percentage of sugar also may help, because sugar stimulates the mouth to produce more saliva.